bond formation cum dearomatization Novel tetranuclear copper … · 2014-07-11 · Amit Kumar, Rampal Pandey, Rakesh Kumar Gupta, Mrigendra Dubey, and Daya Shankar Pandey* Department
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S1
Novel tetranuclear copper |2+4| cubanes resulting from unprecedented C-O bond formation cum dearomatization
Amit Kumar Rampal Pandey Rakesh Kumar Gupta Mrigendra Dubey and Daya Shankar
Pandey
Department of Chemistry Faculty of Science Banaras Hindu University Varanasi - 221 005
India
Supporting Information Placeholder
Contents
1 Experimental Section S22 Result and discussion S53 Fig S1-S6 1H and 13C NMR spectra of H3L1 H2L2 and H2L3 S84 Fig S7-S14 ESI-MS of H3L1 H2L2 H2L3 and 1-3 S115 Fig S15 Absorption spectra of H3L1 H2L2 and H2L3 and 1-3 S156 Fig S16 UVvis (below) and CD (above) spectra of 1 S157 Fig S17 Fluorescence spectra of 1 and 2 S168 Fig S18 CV and DPV of H3L1 H2L2 and H2L3 S169 Fig S19-S21 CV and DPV of 1 2 and 3 S1710 Fig S22 Cu4O4 Cubane core in 2 showing Cu-O and Cu-Cu distances S1811 Fig S23-S28 Hydrogen bonding interactions in 1and 2 S1812 Fig S29 Symmetry axis (C2) in 1and 2 S2213 Fig S30-S33 IR Spectra of Co Ni Mn and Zn complex with H3L1 S2314 Fig S34 1H NMR Spectra of Zn complexes of H3L1and H2L2 S2515 Fig S35-S36 ESI-HRMS of mother liquid S2616 Fig S37 1H NMR titration of H3L1 with Cu(II) S2817 Fig S38 IR spectra of 1 with hydrated and anhydrous solvents S2918 Fig S39 IR spectra of 3 with hydrated and anhydrous solvents S3019 Table S1-S4 Selected bond length and bond angles of H3L1 and 1-3 S3120 Table S5 UVvis data of 1-3 S3321 Table S6-S7 CVDPV data of 1-3 S3322 References S34
Electronic Supplementary Material (ESI) for Dalton TransactionsThis journal is copy The Royal Society of Chemistry 2014
S2
Experimental Section
General methods and materials
Common reagents and solvents were acquired from commercial sources and solvents were
dried and distilled using literature procedures1 Elemental analyses for C H and N were on a
CE-440 Elemental Analyzer Infrared and electronic absorption spectra were obtained on a
Perkin-Elmer Spectrum Version 100305 FT-IR and Shimadzu UV-1601 spectrophoto-
meter respectively The 1H (300 MHz) and 13C (7545 MHz) NMR spectra were obtained on
a JEOL AL300 FT-NMR spectrometer using tetramethylsilane (TMS) as an internal
reference The fluorescence spectra were obtained on a PerkinElmer LS 55 Fluorescence
Spectrometer (UK) Electrospray ionization mass spectrometric data were obtained on a
JEOL Accu TOF JMS-T100 LC mass spectrometer Electrochemical measurements were
made on CHI 620c electrochemical analyzer using single compartment cell equipped with a
glassy carbon working platinum wire counter and AgAg+ reference electrode under
nitrogen atmosphere Electrical conductivity (solution) was measured on a Eutech
Instruments CON 5TDS 5 conductivity meter in methanol
Preparation of 4-(3-Amino-246-trimethylphenylimino)-pent-2-en-2-ol (H3L1)
To a methanolic solution (20 mL) of 246-trimethylbenzene-13-diamine (0751 g 50
mmol) acetylacetone (051 mL 50 mmol) and catalytic amounts of acetic acid were added
and the contents of the flask heated under reflux for 6h After cooling to rt it gave white block
shaped crystals which were separated washed by diethyl ether and dried under vacuo Yield
(1044 g 90) Anal Calcd [C14H20N2O] C 7238 H 868 N 1206 Found C 7222 H
858 N 11981H NMR (CDCl3 δH ppm) 1190 (s 1H OH) 682 (s 1H) 518 (s 1H)
353 (s 2H NH2) 216 (s 3H) 210 (s 3H) 208 (s 6H) 203 (s 3H) 13C NMR (CDCl3 δC
5633341 H2L3) (Fig S7-S9) and strongly supported formation of the respective
compounds In its mass spectrum 1 displayed molecular ion peak at mz 12392887 (calcd
12392973) corresponding to [M3H]+ Prominent peaks assignable to half and one fourth
unit of the cubane 1 at mz 6190770 and 3102382 were also observable (Fig S10) Likewise
ESI-MS of 2 exhibited molecular ion peak at mz 12392827 [M+H]+ (calcd 12392973)
along with two other peaks at mz 6191339 and 3100699 due to half and one fourth units of
the cubane (Fig S11) Isotopic abundance pattern of the molecular ion peaks in 1 and 2
matched well with the calculated one (Fig S12) On the other hand mononuclear complex 3
displayed molecular ion peak [M+H]+ at mz 5262360 (calcd 5262424) which also matched
with calculated isotopic pattern (Fig S13-S14) Overall ESI-Mass spectral pattern is
consistent with the formulation of H3L1 H2L2 and H2L3 tetranuclear cubanes 1 2 and
mononuclear complex 3
Absorption and emission Studies
The electronic absorption spectra of H3L1 H2L2 and H2L3 (c 100 M MeCN) at room
temperature exhibited strong absorptions due to intra-ligand charge transfer transitions in the
high energy region (H3L1 307 H2L2 309 H2L3 303 nm Fig S15 ESIdagger) Cubane 1
exhibited a strong low energy band at ~430 nm and 2 a weak one at ~410 nm attributable to
ligand to metal charge transfer (LMCT) transitions In addition 1 and 2 displayed another
band at ~349 nm and ~347 nm respectively (Table S5) Complex 3 exhibited two bands at
311 and 290 nm associated with ligand based transitions (Fig S15 ESIdagger) Due to
symmetrical nature 1 did not show any band in its CD spectra (Fig S16 ESIdagger)
Generally copper complexes are non fluorescent due to paramagnetic nature of the
Cu(II) Cubane 1 shows weak fluorescence while 2 is almost non fluorescent in nature Upon
excitation at 410 nm 1 displayed a band at 504 nm with quantum yields (Φ) of 007 (1) while
2 shows very weak band at 499 nm The greater fluorescence in 1 relative to 2 may be
attributed to presence of the NH2+ group It was further supported by addition of four equiv of
01M HNO3 to a solution of 2 that leads to a significant fluorescence enhancement that is
almost comparable to 1 (Fig S17 ESIdagger) The conductance measurement in methanol
supported the ionic nature of cubane 1 as 41 electrolyte while 2 is charge neutral species4
S7
Electrochemical Studies
The redox properties of H3L1 H2L2 H2L3 and 1-3 have been investigated by cyclic
voltammograms (CV) and differential pulse voltammograms (DPV) under nitrogen
atmosphere at room temperature in the potential range +20 to 20 V (MeCN c = 100 M)
(Fig S18-S21 Table S6-S7 ESIdagger) In their CV the ligands exhibited an irreversible oxidative
wave at Epa 0520 H3L1 0525 H2L2 and 0518 V H2L3 (Fig S18 ESIdagger) in the anodic
potential window while no wave appeared in the cathodic window Cubanes 1 and 2
displayed irreversible wave in the anodic region at Epa 0559 1 0563 2 and reduction
waves at minus0896 and 0909 V corresponding to Cu2+rarrCu+ redox couple (Fig S19-S20
ESIdagger)5 Since all the four copper centers in 1 and 2 are identical hence in their cyclic
voltmmograms these displayed only a single reduction wave On the other hand mononuclear
complex 3 displayed irreversible oxidation wave at Epa 0536 and reduction wave at minus0691
V due to Cu2+rarrCu+ (Fig S21 ESIdagger) Analogous conclusions has also been drawn on these
systems from DPV (Table S7 ESIdagger)
S8
Fig S1 1H NMR spectrum of H3L1
Fig S2 1H NMR spectrum of H2L2
S9
Fig S3 1H NMR spectrum of H2L3
Fig S4 13C NMR spectrum of H3L1
S10
Fig S5 13C NMR spectrum of H2L2
Fig S6 13C NMR spectrum of H2L3
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
5633341 H2L3) (Fig S7-S9) and strongly supported formation of the respective
compounds In its mass spectrum 1 displayed molecular ion peak at mz 12392887 (calcd
12392973) corresponding to [M3H]+ Prominent peaks assignable to half and one fourth
unit of the cubane 1 at mz 6190770 and 3102382 were also observable (Fig S10) Likewise
ESI-MS of 2 exhibited molecular ion peak at mz 12392827 [M+H]+ (calcd 12392973)
along with two other peaks at mz 6191339 and 3100699 due to half and one fourth units of
the cubane (Fig S11) Isotopic abundance pattern of the molecular ion peaks in 1 and 2
matched well with the calculated one (Fig S12) On the other hand mononuclear complex 3
displayed molecular ion peak [M+H]+ at mz 5262360 (calcd 5262424) which also matched
with calculated isotopic pattern (Fig S13-S14) Overall ESI-Mass spectral pattern is
consistent with the formulation of H3L1 H2L2 and H2L3 tetranuclear cubanes 1 2 and
mononuclear complex 3
Absorption and emission Studies
The electronic absorption spectra of H3L1 H2L2 and H2L3 (c 100 M MeCN) at room
temperature exhibited strong absorptions due to intra-ligand charge transfer transitions in the
high energy region (H3L1 307 H2L2 309 H2L3 303 nm Fig S15 ESIdagger) Cubane 1
exhibited a strong low energy band at ~430 nm and 2 a weak one at ~410 nm attributable to
ligand to metal charge transfer (LMCT) transitions In addition 1 and 2 displayed another
band at ~349 nm and ~347 nm respectively (Table S5) Complex 3 exhibited two bands at
311 and 290 nm associated with ligand based transitions (Fig S15 ESIdagger) Due to
symmetrical nature 1 did not show any band in its CD spectra (Fig S16 ESIdagger)
Generally copper complexes are non fluorescent due to paramagnetic nature of the
Cu(II) Cubane 1 shows weak fluorescence while 2 is almost non fluorescent in nature Upon
excitation at 410 nm 1 displayed a band at 504 nm with quantum yields (Φ) of 007 (1) while
2 shows very weak band at 499 nm The greater fluorescence in 1 relative to 2 may be
attributed to presence of the NH2+ group It was further supported by addition of four equiv of
01M HNO3 to a solution of 2 that leads to a significant fluorescence enhancement that is
almost comparable to 1 (Fig S17 ESIdagger) The conductance measurement in methanol
supported the ionic nature of cubane 1 as 41 electrolyte while 2 is charge neutral species4
S7
Electrochemical Studies
The redox properties of H3L1 H2L2 H2L3 and 1-3 have been investigated by cyclic
voltammograms (CV) and differential pulse voltammograms (DPV) under nitrogen
atmosphere at room temperature in the potential range +20 to 20 V (MeCN c = 100 M)
(Fig S18-S21 Table S6-S7 ESIdagger) In their CV the ligands exhibited an irreversible oxidative
wave at Epa 0520 H3L1 0525 H2L2 and 0518 V H2L3 (Fig S18 ESIdagger) in the anodic
potential window while no wave appeared in the cathodic window Cubanes 1 and 2
displayed irreversible wave in the anodic region at Epa 0559 1 0563 2 and reduction
waves at minus0896 and 0909 V corresponding to Cu2+rarrCu+ redox couple (Fig S19-S20
ESIdagger)5 Since all the four copper centers in 1 and 2 are identical hence in their cyclic
voltmmograms these displayed only a single reduction wave On the other hand mononuclear
complex 3 displayed irreversible oxidation wave at Epa 0536 and reduction wave at minus0691
V due to Cu2+rarrCu+ (Fig S21 ESIdagger) Analogous conclusions has also been drawn on these
systems from DPV (Table S7 ESIdagger)
S8
Fig S1 1H NMR spectrum of H3L1
Fig S2 1H NMR spectrum of H2L2
S9
Fig S3 1H NMR spectrum of H2L3
Fig S4 13C NMR spectrum of H3L1
S10
Fig S5 13C NMR spectrum of H2L2
Fig S6 13C NMR spectrum of H2L3
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
5633341 H2L3) (Fig S7-S9) and strongly supported formation of the respective
compounds In its mass spectrum 1 displayed molecular ion peak at mz 12392887 (calcd
12392973) corresponding to [M3H]+ Prominent peaks assignable to half and one fourth
unit of the cubane 1 at mz 6190770 and 3102382 were also observable (Fig S10) Likewise
ESI-MS of 2 exhibited molecular ion peak at mz 12392827 [M+H]+ (calcd 12392973)
along with two other peaks at mz 6191339 and 3100699 due to half and one fourth units of
the cubane (Fig S11) Isotopic abundance pattern of the molecular ion peaks in 1 and 2
matched well with the calculated one (Fig S12) On the other hand mononuclear complex 3
displayed molecular ion peak [M+H]+ at mz 5262360 (calcd 5262424) which also matched
with calculated isotopic pattern (Fig S13-S14) Overall ESI-Mass spectral pattern is
consistent with the formulation of H3L1 H2L2 and H2L3 tetranuclear cubanes 1 2 and
mononuclear complex 3
Absorption and emission Studies
The electronic absorption spectra of H3L1 H2L2 and H2L3 (c 100 M MeCN) at room
temperature exhibited strong absorptions due to intra-ligand charge transfer transitions in the
high energy region (H3L1 307 H2L2 309 H2L3 303 nm Fig S15 ESIdagger) Cubane 1
exhibited a strong low energy band at ~430 nm and 2 a weak one at ~410 nm attributable to
ligand to metal charge transfer (LMCT) transitions In addition 1 and 2 displayed another
band at ~349 nm and ~347 nm respectively (Table S5) Complex 3 exhibited two bands at
311 and 290 nm associated with ligand based transitions (Fig S15 ESIdagger) Due to
symmetrical nature 1 did not show any band in its CD spectra (Fig S16 ESIdagger)
Generally copper complexes are non fluorescent due to paramagnetic nature of the
Cu(II) Cubane 1 shows weak fluorescence while 2 is almost non fluorescent in nature Upon
excitation at 410 nm 1 displayed a band at 504 nm with quantum yields (Φ) of 007 (1) while
2 shows very weak band at 499 nm The greater fluorescence in 1 relative to 2 may be
attributed to presence of the NH2+ group It was further supported by addition of four equiv of
01M HNO3 to a solution of 2 that leads to a significant fluorescence enhancement that is
almost comparable to 1 (Fig S17 ESIdagger) The conductance measurement in methanol
supported the ionic nature of cubane 1 as 41 electrolyte while 2 is charge neutral species4
S7
Electrochemical Studies
The redox properties of H3L1 H2L2 H2L3 and 1-3 have been investigated by cyclic
voltammograms (CV) and differential pulse voltammograms (DPV) under nitrogen
atmosphere at room temperature in the potential range +20 to 20 V (MeCN c = 100 M)
(Fig S18-S21 Table S6-S7 ESIdagger) In their CV the ligands exhibited an irreversible oxidative
wave at Epa 0520 H3L1 0525 H2L2 and 0518 V H2L3 (Fig S18 ESIdagger) in the anodic
potential window while no wave appeared in the cathodic window Cubanes 1 and 2
displayed irreversible wave in the anodic region at Epa 0559 1 0563 2 and reduction
waves at minus0896 and 0909 V corresponding to Cu2+rarrCu+ redox couple (Fig S19-S20
ESIdagger)5 Since all the four copper centers in 1 and 2 are identical hence in their cyclic
voltmmograms these displayed only a single reduction wave On the other hand mononuclear
complex 3 displayed irreversible oxidation wave at Epa 0536 and reduction wave at minus0691
V due to Cu2+rarrCu+ (Fig S21 ESIdagger) Analogous conclusions has also been drawn on these
systems from DPV (Table S7 ESIdagger)
S8
Fig S1 1H NMR spectrum of H3L1
Fig S2 1H NMR spectrum of H2L2
S9
Fig S3 1H NMR spectrum of H2L3
Fig S4 13C NMR spectrum of H3L1
S10
Fig S5 13C NMR spectrum of H2L2
Fig S6 13C NMR spectrum of H2L3
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
5633341 H2L3) (Fig S7-S9) and strongly supported formation of the respective
compounds In its mass spectrum 1 displayed molecular ion peak at mz 12392887 (calcd
12392973) corresponding to [M3H]+ Prominent peaks assignable to half and one fourth
unit of the cubane 1 at mz 6190770 and 3102382 were also observable (Fig S10) Likewise
ESI-MS of 2 exhibited molecular ion peak at mz 12392827 [M+H]+ (calcd 12392973)
along with two other peaks at mz 6191339 and 3100699 due to half and one fourth units of
the cubane (Fig S11) Isotopic abundance pattern of the molecular ion peaks in 1 and 2
matched well with the calculated one (Fig S12) On the other hand mononuclear complex 3
displayed molecular ion peak [M+H]+ at mz 5262360 (calcd 5262424) which also matched
with calculated isotopic pattern (Fig S13-S14) Overall ESI-Mass spectral pattern is
consistent with the formulation of H3L1 H2L2 and H2L3 tetranuclear cubanes 1 2 and
mononuclear complex 3
Absorption and emission Studies
The electronic absorption spectra of H3L1 H2L2 and H2L3 (c 100 M MeCN) at room
temperature exhibited strong absorptions due to intra-ligand charge transfer transitions in the
high energy region (H3L1 307 H2L2 309 H2L3 303 nm Fig S15 ESIdagger) Cubane 1
exhibited a strong low energy band at ~430 nm and 2 a weak one at ~410 nm attributable to
ligand to metal charge transfer (LMCT) transitions In addition 1 and 2 displayed another
band at ~349 nm and ~347 nm respectively (Table S5) Complex 3 exhibited two bands at
311 and 290 nm associated with ligand based transitions (Fig S15 ESIdagger) Due to
symmetrical nature 1 did not show any band in its CD spectra (Fig S16 ESIdagger)
Generally copper complexes are non fluorescent due to paramagnetic nature of the
Cu(II) Cubane 1 shows weak fluorescence while 2 is almost non fluorescent in nature Upon
excitation at 410 nm 1 displayed a band at 504 nm with quantum yields (Φ) of 007 (1) while
2 shows very weak band at 499 nm The greater fluorescence in 1 relative to 2 may be
attributed to presence of the NH2+ group It was further supported by addition of four equiv of
01M HNO3 to a solution of 2 that leads to a significant fluorescence enhancement that is
almost comparable to 1 (Fig S17 ESIdagger) The conductance measurement in methanol
supported the ionic nature of cubane 1 as 41 electrolyte while 2 is charge neutral species4
S7
Electrochemical Studies
The redox properties of H3L1 H2L2 H2L3 and 1-3 have been investigated by cyclic
voltammograms (CV) and differential pulse voltammograms (DPV) under nitrogen
atmosphere at room temperature in the potential range +20 to 20 V (MeCN c = 100 M)
(Fig S18-S21 Table S6-S7 ESIdagger) In their CV the ligands exhibited an irreversible oxidative
wave at Epa 0520 H3L1 0525 H2L2 and 0518 V H2L3 (Fig S18 ESIdagger) in the anodic
potential window while no wave appeared in the cathodic window Cubanes 1 and 2
displayed irreversible wave in the anodic region at Epa 0559 1 0563 2 and reduction
waves at minus0896 and 0909 V corresponding to Cu2+rarrCu+ redox couple (Fig S19-S20
ESIdagger)5 Since all the four copper centers in 1 and 2 are identical hence in their cyclic
voltmmograms these displayed only a single reduction wave On the other hand mononuclear
complex 3 displayed irreversible oxidation wave at Epa 0536 and reduction wave at minus0691
V due to Cu2+rarrCu+ (Fig S21 ESIdagger) Analogous conclusions has also been drawn on these
systems from DPV (Table S7 ESIdagger)
S8
Fig S1 1H NMR spectrum of H3L1
Fig S2 1H NMR spectrum of H2L2
S9
Fig S3 1H NMR spectrum of H2L3
Fig S4 13C NMR spectrum of H3L1
S10
Fig S5 13C NMR spectrum of H2L2
Fig S6 13C NMR spectrum of H2L3
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
5633341 H2L3) (Fig S7-S9) and strongly supported formation of the respective
compounds In its mass spectrum 1 displayed molecular ion peak at mz 12392887 (calcd
12392973) corresponding to [M3H]+ Prominent peaks assignable to half and one fourth
unit of the cubane 1 at mz 6190770 and 3102382 were also observable (Fig S10) Likewise
ESI-MS of 2 exhibited molecular ion peak at mz 12392827 [M+H]+ (calcd 12392973)
along with two other peaks at mz 6191339 and 3100699 due to half and one fourth units of
the cubane (Fig S11) Isotopic abundance pattern of the molecular ion peaks in 1 and 2
matched well with the calculated one (Fig S12) On the other hand mononuclear complex 3
displayed molecular ion peak [M+H]+ at mz 5262360 (calcd 5262424) which also matched
with calculated isotopic pattern (Fig S13-S14) Overall ESI-Mass spectral pattern is
consistent with the formulation of H3L1 H2L2 and H2L3 tetranuclear cubanes 1 2 and
mononuclear complex 3
Absorption and emission Studies
The electronic absorption spectra of H3L1 H2L2 and H2L3 (c 100 M MeCN) at room
temperature exhibited strong absorptions due to intra-ligand charge transfer transitions in the
high energy region (H3L1 307 H2L2 309 H2L3 303 nm Fig S15 ESIdagger) Cubane 1
exhibited a strong low energy band at ~430 nm and 2 a weak one at ~410 nm attributable to
ligand to metal charge transfer (LMCT) transitions In addition 1 and 2 displayed another
band at ~349 nm and ~347 nm respectively (Table S5) Complex 3 exhibited two bands at
311 and 290 nm associated with ligand based transitions (Fig S15 ESIdagger) Due to
symmetrical nature 1 did not show any band in its CD spectra (Fig S16 ESIdagger)
Generally copper complexes are non fluorescent due to paramagnetic nature of the
Cu(II) Cubane 1 shows weak fluorescence while 2 is almost non fluorescent in nature Upon
excitation at 410 nm 1 displayed a band at 504 nm with quantum yields (Φ) of 007 (1) while
2 shows very weak band at 499 nm The greater fluorescence in 1 relative to 2 may be
attributed to presence of the NH2+ group It was further supported by addition of four equiv of
01M HNO3 to a solution of 2 that leads to a significant fluorescence enhancement that is
almost comparable to 1 (Fig S17 ESIdagger) The conductance measurement in methanol
supported the ionic nature of cubane 1 as 41 electrolyte while 2 is charge neutral species4
S7
Electrochemical Studies
The redox properties of H3L1 H2L2 H2L3 and 1-3 have been investigated by cyclic
voltammograms (CV) and differential pulse voltammograms (DPV) under nitrogen
atmosphere at room temperature in the potential range +20 to 20 V (MeCN c = 100 M)
(Fig S18-S21 Table S6-S7 ESIdagger) In their CV the ligands exhibited an irreversible oxidative
wave at Epa 0520 H3L1 0525 H2L2 and 0518 V H2L3 (Fig S18 ESIdagger) in the anodic
potential window while no wave appeared in the cathodic window Cubanes 1 and 2
displayed irreversible wave in the anodic region at Epa 0559 1 0563 2 and reduction
waves at minus0896 and 0909 V corresponding to Cu2+rarrCu+ redox couple (Fig S19-S20
ESIdagger)5 Since all the four copper centers in 1 and 2 are identical hence in their cyclic
voltmmograms these displayed only a single reduction wave On the other hand mononuclear
complex 3 displayed irreversible oxidation wave at Epa 0536 and reduction wave at minus0691
V due to Cu2+rarrCu+ (Fig S21 ESIdagger) Analogous conclusions has also been drawn on these
systems from DPV (Table S7 ESIdagger)
S8
Fig S1 1H NMR spectrum of H3L1
Fig S2 1H NMR spectrum of H2L2
S9
Fig S3 1H NMR spectrum of H2L3
Fig S4 13C NMR spectrum of H3L1
S10
Fig S5 13C NMR spectrum of H2L2
Fig S6 13C NMR spectrum of H2L3
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
5633341 H2L3) (Fig S7-S9) and strongly supported formation of the respective
compounds In its mass spectrum 1 displayed molecular ion peak at mz 12392887 (calcd
12392973) corresponding to [M3H]+ Prominent peaks assignable to half and one fourth
unit of the cubane 1 at mz 6190770 and 3102382 were also observable (Fig S10) Likewise
ESI-MS of 2 exhibited molecular ion peak at mz 12392827 [M+H]+ (calcd 12392973)
along with two other peaks at mz 6191339 and 3100699 due to half and one fourth units of
the cubane (Fig S11) Isotopic abundance pattern of the molecular ion peaks in 1 and 2
matched well with the calculated one (Fig S12) On the other hand mononuclear complex 3
displayed molecular ion peak [M+H]+ at mz 5262360 (calcd 5262424) which also matched
with calculated isotopic pattern (Fig S13-S14) Overall ESI-Mass spectral pattern is
consistent with the formulation of H3L1 H2L2 and H2L3 tetranuclear cubanes 1 2 and
mononuclear complex 3
Absorption and emission Studies
The electronic absorption spectra of H3L1 H2L2 and H2L3 (c 100 M MeCN) at room
temperature exhibited strong absorptions due to intra-ligand charge transfer transitions in the
high energy region (H3L1 307 H2L2 309 H2L3 303 nm Fig S15 ESIdagger) Cubane 1
exhibited a strong low energy band at ~430 nm and 2 a weak one at ~410 nm attributable to
ligand to metal charge transfer (LMCT) transitions In addition 1 and 2 displayed another
band at ~349 nm and ~347 nm respectively (Table S5) Complex 3 exhibited two bands at
311 and 290 nm associated with ligand based transitions (Fig S15 ESIdagger) Due to
symmetrical nature 1 did not show any band in its CD spectra (Fig S16 ESIdagger)
Generally copper complexes are non fluorescent due to paramagnetic nature of the
Cu(II) Cubane 1 shows weak fluorescence while 2 is almost non fluorescent in nature Upon
excitation at 410 nm 1 displayed a band at 504 nm with quantum yields (Φ) of 007 (1) while
2 shows very weak band at 499 nm The greater fluorescence in 1 relative to 2 may be
attributed to presence of the NH2+ group It was further supported by addition of four equiv of
01M HNO3 to a solution of 2 that leads to a significant fluorescence enhancement that is
almost comparable to 1 (Fig S17 ESIdagger) The conductance measurement in methanol
supported the ionic nature of cubane 1 as 41 electrolyte while 2 is charge neutral species4
S7
Electrochemical Studies
The redox properties of H3L1 H2L2 H2L3 and 1-3 have been investigated by cyclic
voltammograms (CV) and differential pulse voltammograms (DPV) under nitrogen
atmosphere at room temperature in the potential range +20 to 20 V (MeCN c = 100 M)
(Fig S18-S21 Table S6-S7 ESIdagger) In their CV the ligands exhibited an irreversible oxidative
wave at Epa 0520 H3L1 0525 H2L2 and 0518 V H2L3 (Fig S18 ESIdagger) in the anodic
potential window while no wave appeared in the cathodic window Cubanes 1 and 2
displayed irreversible wave in the anodic region at Epa 0559 1 0563 2 and reduction
waves at minus0896 and 0909 V corresponding to Cu2+rarrCu+ redox couple (Fig S19-S20
ESIdagger)5 Since all the four copper centers in 1 and 2 are identical hence in their cyclic
voltmmograms these displayed only a single reduction wave On the other hand mononuclear
complex 3 displayed irreversible oxidation wave at Epa 0536 and reduction wave at minus0691
V due to Cu2+rarrCu+ (Fig S21 ESIdagger) Analogous conclusions has also been drawn on these
systems from DPV (Table S7 ESIdagger)
S8
Fig S1 1H NMR spectrum of H3L1
Fig S2 1H NMR spectrum of H2L2
S9
Fig S3 1H NMR spectrum of H2L3
Fig S4 13C NMR spectrum of H3L1
S10
Fig S5 13C NMR spectrum of H2L2
Fig S6 13C NMR spectrum of H2L3
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S7
Electrochemical Studies
The redox properties of H3L1 H2L2 H2L3 and 1-3 have been investigated by cyclic
voltammograms (CV) and differential pulse voltammograms (DPV) under nitrogen
atmosphere at room temperature in the potential range +20 to 20 V (MeCN c = 100 M)
(Fig S18-S21 Table S6-S7 ESIdagger) In their CV the ligands exhibited an irreversible oxidative
wave at Epa 0520 H3L1 0525 H2L2 and 0518 V H2L3 (Fig S18 ESIdagger) in the anodic
potential window while no wave appeared in the cathodic window Cubanes 1 and 2
displayed irreversible wave in the anodic region at Epa 0559 1 0563 2 and reduction
waves at minus0896 and 0909 V corresponding to Cu2+rarrCu+ redox couple (Fig S19-S20
ESIdagger)5 Since all the four copper centers in 1 and 2 are identical hence in their cyclic
voltmmograms these displayed only a single reduction wave On the other hand mononuclear
complex 3 displayed irreversible oxidation wave at Epa 0536 and reduction wave at minus0691
V due to Cu2+rarrCu+ (Fig S21 ESIdagger) Analogous conclusions has also been drawn on these
systems from DPV (Table S7 ESIdagger)
S8
Fig S1 1H NMR spectrum of H3L1
Fig S2 1H NMR spectrum of H2L2
S9
Fig S3 1H NMR spectrum of H2L3
Fig S4 13C NMR spectrum of H3L1
S10
Fig S5 13C NMR spectrum of H2L2
Fig S6 13C NMR spectrum of H2L3
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S8
Fig S1 1H NMR spectrum of H3L1
Fig S2 1H NMR spectrum of H2L2
S9
Fig S3 1H NMR spectrum of H2L3
Fig S4 13C NMR spectrum of H3L1
S10
Fig S5 13C NMR spectrum of H2L2
Fig S6 13C NMR spectrum of H2L3
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S9
Fig S3 1H NMR spectrum of H2L3
Fig S4 13C NMR spectrum of H3L1
S10
Fig S5 13C NMR spectrum of H2L2
Fig S6 13C NMR spectrum of H2L3
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S10
Fig S5 13C NMR spectrum of H2L2
Fig S6 13C NMR spectrum of H2L3
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S11
FigS7 ESI-Mass spectrum of H3L1
Fig S8 ESI-Mass spectrum of H2L2
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S12
Fig S9 ESI-Mass spectrum of H2L3
Fig S10 ESI-Mass spectrum of 1
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S13
Fig S11 ESI-Mass spectrum of 2
(a) (b)
Fig S12 Simulated isotopic pattern in ESI-Mass spectrum of 1 at mz 12392887 (a) and 2 at
mz 12392827 (b) calculated (black) and experimental (red)
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S14
Fig S13 ESI-Mass spectrum of 3
Fig S14 Simulated isotopic pattern for ESI-Mass spectrum of 3 (mz 5262360) calculated
(black) and experimental (red)
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S15
Fig S15 UVvis spectra of H3L1 H2L2 H2L3 (a) and 1-3 (b) in MeCN (c 100 μM)
Fig S16 UVvis (bottom) and CD (top) spectra of 1
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S16
Fig S17 Emission spectra of cubane 1 (green) 2 (black) and 2 + HNO3 (4 equiv red)
(a) (b)
Fig S18 Cyclic (a) and differential pulse voltammograms (b) for H3L1 H2L2 H2L3 in
MeCN (c = 100 μM)
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S17
(a) (b)
Fig S19 Cyclic (a) and differential pulse voltammograms (b) for 1 in MeCN (c 100 M)
(a) (b)
Fig S20 Cyclic (a) and differential pulse voltammograms (b) for 2 in MeCN (c 100 M)
(a) (b)
Fig S21 Cyclic (a) and differential pulse voltammograms (b) for 3 in MeCN (c 100 M)
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S18
Fig S22 Cu4O4 cubane core showing CuO and CuCu distances in 2
Fig S23 Hydrogen bonding interactions between one =NH2+ (N4) and oxygen atoms from
two nitrates (N4H4A4BmiddotmiddotmiddotO9 28723004) and other =NH2+ (N2) with water
(N2H2AmiddotmiddotmiddotO11 2826) in 1
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S19
(a)
(b)
Fig S24 Hydrogen bonding interactions between =NH2+ (N4) and oxygen from the nitrates
(N4H4A4BmiddotmiddotmiddotO9) resulting in a rectangular cavity in 1
(a)
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S20
(b)
Fig S25 Hydrogen bonding interactions between =NH2+ (N2) and oxygen from water and
nitrates (N2H2AmiddotmiddotmiddotO11) in 1
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S21
(a)
(b)
Fig S26 Hydrogen bonding interactions between =NH with water (N2H2middotmiddotmiddotO11
N4H4middotmiddotmiddotO12 27013048 Aring) (a) and arrangment of water molecules in rectangle
environment (b) in 2
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S22
Fig S27 Helical structure resulting from hydrogen bonding between =NH2+ with oxygen of
the nitrates and water along c axis in 1
Fig S28 Helical arrangement of water molecules in 2 through hydrogen bonding interactions
Fig S29 Symmetric C2 axis passing through cubane center of 1 and 2
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S23
Fig S30 IR spectra of the Co complex with H3L1
Fig S31 IR spectra of the Ni complex with H3L1
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S24
Fig S32 IR spectra of the Mn complex with H3L1
Fig S33 IR spectra of the Zn complex with H3L1
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S25
(a)
(b)
Fig S34 1H NMR spectra for the Zn complexes [derived from H3L1 Zn(H2L1)2 (a) and
H2L2 (ZnL2)2 (b)] showing lack of any transformation in the ligands
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S26
Fig S35 HRMS of mother liquid in full range showing a feeble peak for H3L1O (blue
arrow in red circle)
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S27
Fig S36 HRMS of mother liquid in specific range for H3L1O
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)
Table S2 Comparative bond lengths (Aring) in cubane core of 1 and 2
Bond lengths 1 2
Cu1-O1 2378(3) 2328(2)
Cu2-O3 2370(3) 2329(2)
Cu1-O3 1984(2)2005(2) 1986(2)2009(2)
Cu2-O1 1992(3)1997(2) 1981(2)2014(2)
Cu1Cu1 29825(9) 29977(8)
Cu2Cu2 29798(9) 29978(8)
Cu1Cu2 33283331 32693294
Table S3 Selected bond lengths (Aring) in H3L1 1 2 and 3
Bond lengths H3L1 1 2 3
N1-C10 1339(3) 1330(4) 1321(5) 1313(4)
N1-C2 1449(3) 1417(4) 1414(4) 1445(3)
O1-C12 1252(3) - - 1292(4)
C1-C2 1390(3) 1506(6) 1522(5) 1386(5)
C2-C3 1396(3) 1347(5) 1337(5) 1384(5)
C3-C4 1410(3) 1446(6) 1475(5) 1422(5)
C4-C5 1399(3) 1470(6) 1473(6) 1392(7)
C5-C6 1386(3) 1320(6) 1320(5) 1345(7)
C1-C6 1393(3) 1490(5) 1486(5) 1397(5)
N2-C4 1398(3) 1290(4) 1282(5) 1404(6)
C1-O1 - 1434(4) - -
C12-O2 - 1287(5) - -
N1-Cu2 - 19311(17) 1941(3) 1968(2)
N3-Cu1 - 19359(18) 1939(3) -
O2-Cu2 - 1899(3) 1896(2) -
O4-Cu1 - 1899(3) 1907(3) 1898(2)
S33
Table S4 Selected bond angles in the cubane core of 1 and 2
Bond angles 1 2
Cu1-O3-Cu1 9678(10) 9723(9)
Cu2-O1-Cu2 9665(10) 9726(9)
Cu1-O1-Cu2 9883(10) 9882(10) 9837(9)9842(9)
Cu1-O3-Cu2 9946(10) 9873(10) 9921(9)9755(9)
O1-Cu2-O1 8211(10) 8175(9)
O3-Cu1-O3 8187(10) 8178(9)
O1-Cu1-O3 8051(10)8054(10) 8111(8)8119(8)
O1-Cu2-O3 8047(9)8100(9) 8055(9)8175(8)
Table S5 UV-vis absorption bands (λmax nm ε M-1cm-1) for 1-3 (c 100M Acetonitrile)
1 2 3
430 (407 times 103) 410 (142 times 103)
349 (453 times 103) 347 (862 times 103) 311 (7 27 times 103)
278 (921 times 103) 281 (870 times 103) 290 (849 times 103)
Table S6 Electrochemical (CV) data of the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Table S7 Electrochemical (DPV) data for the ligands H3L1 H2L2 H2L3 and complexes 1-3 (c 100 μM MeCN)
Oxidation potential (V) Reduction potential (V)
H3L1 0520 -
H2L2 0525 -
H2L3 0518 -
1 0559 -0896
2 0563 -0909
3 0536 -0691
S34
References
1 D D Perrin W L F Armango and D R Perrin Purification of laboratory Chemicals
Pergamon Oxford UK 1986
2 (a) G M Sheldrick SHELXL-97 Program for X-ray Crystal Structure Refinement
Gottingen University Gottingen Germany 1997 (b) G M Sheldrick SHELXS-97
Program for X-ray Crystal Structure Solution Gottingen University Gottingen Germany
1997
3 (a) A L Spek PLATON A Multipurpose Crystallographic Tools Utrecht University
Utrecht The Netherlands 2000 (b) A L Spek Acta Crystallogr Sect A 1990 46 C31
4 W J Geary Coord Chem Rev 1971 7 81
5 M Koumlrner P A Tregloan and R van Eldik Dalton Trans 2003 2710
Oxidation potential (V) Reduction potential (V)
H3L1 0507 -
H2L2 0512 -
H2L3 0513 -
1 - -0875
2 - -0891
3 - -0641
S28
0 equiv Cu(II)
025 equiv Cu(II)
050 equiv Cu(II)
075 equiv Cu(II)
10 equiv Cu(II)
H1 H2 H3
Fig S37 1H NMR titration of H3L1 (CD3OD) vs Cu(II) nitrate in D2O showing spectral changes involved in the formation of 1 Aromatic proton H1 shifted toward down field while allylic proton upfield side and methyl protons broadened and shifted towards both upfield and down filed region The results show complete disruption of the aromaticity of H3L1 Amine protons (H3) may be merged with the solvent peak at 380 ppm No peak corresponding to H3L1O appeared in the spectra which suggested immediate complexation of the oxidized species with metal and discard the free existence of H3L1O
NH2
N
OH
Cu(NO3)225H2O
O
N
NH
OCu
O Cu
N
O
HN
O
N
NH
OCuO
N
HN
O CuH3L1
Cubane
H1
H3
H2
S29
Fig S38 IR Spectra of the product from reaction between H3L1 and Cu(NO3)225H2O in
presence of MeOHKOH (a) dry CH3CNNaH (b) and dry CH3CNNaH under nitrogen
atmosphere (c)
(a)
(b)
(c)
(a)
(b)
S30
a
b
Fig S39 IR Spectra of 3 synthesized using MeOHKOH (a) and dry CH3CNNaH (b)
S31
Table S1 Crystallographic parameter of H3L1 1a-c 2 and 3
H3L1 1a 1b 1c 2 3
empirical formula C14H20N2O C56H80Cu4N12O22 C56H80Cu4N12O22 C56H80Cu4N12O22 C56H72Cu4N8O12 C28H38CuN4O2
formula weight 23232 152752 152752 152748 130338 52616
crystal system Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic Monoclinic
space group P21c P2n P2n P2n C2c C2c
a (Adeg) 83343 (17) 174218(4) 174716(4) 174957(8) 256867(6) 135908(3)
b (Adeg) 84636(17) 98690(2) 98593(2) 98364(4) 95991(2) 116711(3)
c (Adeg) 18908(4) 195378(5) 195176(5) 195011(9) 253877(7) 176727(3)