Chem 117 Reference Spectra Spring 2011 1 H, 13 C NMR data taken from: Silverstein, Robert M.; Webster, Francis X.; Kiemle, D. J. Spectrometric Identification of Organic Compounds,7 th ed.; Wiley: 2005. IR data taken from: Lambert, Joseph F.; Shurvell, H. F.; Lightner, D. A.; Cooks, R. Graham Organic Structural Spectroscopy,1 st ed.; Prentice‐Hall: 1998.
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Chem 117 Reference Spectra Spring 2011 H, C NMR data ... Data Sheet.pdf192 CHAPTER 3 PROTON NMR SPECTROMETRY TABLE B.2b Observed Methine Proton Chemical Shifts of Isopropyl Derivatives.
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Chem 117 Reference Spectra Spring 2011
1H, 13C NMR data taken from: Silverstein, Robert M.; Webster, Francis X.; Kiemle, D. J. Spectrometric Identification of Organic Compounds, 7th ed.; Wiley: 2005. IR data taken from: Lambert, Joseph F.; Shurvell, H. F.; Lightner, D. A.; Cooks, R. Graham Organic Structural Spectroscopy, 1st ed.; Prentice‐Hall: 1998.
I: 1, J
188 CHAPTER 3 PROTON NMR SPECTROMETRY
CHART A.1 CHEMICAL SHIFTS OF PROTONS ON A CARBON ATOM ADJACENT (a POSITION) TO A FUNCTIONAL GROUP
APPENDIX A IN ALIPHATIC COMPOUNDS (M - V) ~~------------------
I M = methyl 8 M methylene
M methine 8 A 2 5 ~ £ A 2 4 ~ £ A 2 3 ~ ~ A 2 2 ~ £ A 2 1 • £ A 2 0
M-CH2R 0 • 1 • M-C~C
0 0
M-C:::C I M-Ph • I • M-F I 15 I
M-CI • 0 I • 0
M-6r • • I
M-I • 0 .1 L • 0
M-OH I I
M-OR
M-OPh 1 I:! 0 I 0
M-OC(=O)R !. 0
I • i 0 -
I M-OC(=O)ph • I .. •
M-OC(=O)CF3 0 I 0
M-OTs' • I ! 0 I • 0
M-C(~O)H • >
i • M-C(=O)R • :0
I I • 0
M-C( OIPh 0
0 i
M-C(=O)OH • : 0 I • 0
! J: 0 M-C(=OIOR 0
M-CI=OINR2 0 0
• 0 I M-C:=N • 0
M NH2 • 0 I . • 0
M-NR2 • I • M NPhR
I
0 1
0
M WR3 ~ I !
M-NHC(=O)R 0 I 0
M-N02 ~I I
A 2 5 ~ £ A 2 4 ~ £ A 2 3 ~ £ A 2 2 ~ £ A 2 1 B £ A 2 0
CHART A.2 CHEMICAL SHIFTS OF PROTONS ON A CARBON ATOM ONCE REMOVED (fJ POSITION) FROM A FUNCTIONAL
APPENDIX A GROUP IN ALIPHATIC COMPOUNDS (M-C-V)
• M methyl 8 M methylene
M = methine /j
.6 .5 .4 .3 .2 .1 1 .9 .8 .7 .6 .5 4 3 2 1 0
M-C -CH 2 • I
~ • .
M-C-C=C • • 0
. • 0
M-C-C::::C I
~ M-C-Ph 41 I
M-C -F :. 0 I • 0
M-C-CI • I • M-C-Br 0
0 t M-C-j ~ I
H-i--
M-C-OH • • M-C-OR •
tfi M-C-OPh 0
++ 0
I
M-C-OC( OIR
M-C-OC(=O)Ph • 0 I I n • 0 .
M-C-OC(=OICF3 0 0
M-C-C(=O)H 0:
0,
M-C-C(=O)R • 0 I +-H-4 • 0
M-C-C(=O)Ph 0 I
M- C -C("' OIOR I -I
I .
ffi M- C -C( = O)NR 2 (
M-C-C:::N 0 I 0
M-C-NR 2 m I I
M-C-NPhR
IT I--
+ • 0 M-C-NR3 • 0
r----' M-C-NHC( OIR
I
M-C-N02 0
!
I 10
M-C-SH • • M -C -SR I
APPENDIX B 191
EFFECT ON CHEMICAL SHIFTS BY TWO OR THREE DIRECTLY APPENDIX B ATTACHED FUNCTIONAL GROUPS
Y-CH2-Zand Y-CH-Z I
W
The chemical shift of a methylene group attached to two functional groups can be calculated by means of the substituent constants ( u values) in Table B.l. Shoolery's rule* states that the sum of the constants for the attached functional groups is added to S 0.23, the chemical shift for CH4 :
The chemical shift for the methylene protons, of C6HsCH2Br, for example, is calculated from the u values in Table B.1.
0.23 O'PI! 1.85 UBr 2.33
() = 4.41 Found, () 4.43
Shoolery's original constants have been revised and extended in Table B.1. Ibe observed and calculated chemical shifts for 62% of the samples tested were within :to.2 ppm, 92% within :to.3 ppm. 96% within 0.4 ppm, and 99% within :to.5 ppm:r Table B.l contains substituent constants (Friedrich and Runkle, 1984) for the more common functional
* Shoolery, IN, (1959), Varian Technicallnforll1atiol1 Blllletin. Vol 2, No.3. Palo Alto, CA: Varian Associales. t Data from Friedrich, E.C., and Runkle. K.G. (1984) . .1. Chem. Educ. 61,830; (1986)63,127.
TABLE B.1 Substituent Constants for Alkyl Methylene (and Methyl) Protons.
groups. Note that chemical shifts of methyl protons can be ealculated by using the constant for H (0.34). For example H-CH2-Br is equivalent to CH)Br.
Tables B.2a, B.2b, and B.2c: Chemical Shift Correlations for Methine Protons
Table B.2a the substituent constants* to be used with the formulation
() CHXYZ = 2.50 + Ux + Uy + O'z
which is satisfactory if at least two of the substituents are electron-withdrawing groups. In other words, only a single substituent may be an alkyl group (R). Within these limits, the standard error of estimate is 0.20 ppm. For example, the chemical shift of the methine proton in
OEt I
CH-CH-OEt 3
is calculated from Table B.2a as follows:
() = 2.50 -+ 1.14 + 1.14 + 0.00 4.78
TIle found value is 4.72. Tables B,2b and B.2c are used jointly for methine pro
tons that are substituted by at least two alkyl groups
Bell. H.M., Bowles, D.B. and Senese, F. (1981). Org. Magn. Resoll .. 16,285. Wilh permission.
TABLE B.2a Substituent Constants for Methine Protons.
CI 4.14 R2(H2)N 3.07 Br 4.21 R(H)C(=O)NH 4.01 I 4.24 02N 4.67
(or other groups of low polarity). Friedrich and Runkle proposed the relationship
0CHXYZ O(CH)),CHZ Axy
in which the X and Y substituents are alkyl groups or other groups of low polarity. The Z susbstituent covers a range of polarities. ~xy is a correction factor. Ine relationship states that the chemical shift of a methine proton with at least two low-polarity groups is equivalent to the chemical shift of an isopropyl methine proton plus correction factor.
The substituent constants for a Z substituent on an isopropyl methine proton are given in Table B.2b. The ~y correction factors are given in Table B.2c.
The following example illustrates the joint use of Tables B.2b and B.2c, with CH3, CH=CH2, and as substituents. The most polar substituent is always designated Z.
TABLE B.2c Correction Factors for Methine Substituents of Low Polarity.
Cyclic Open-Chain Methine Methine Proton Proton Systems lixy Systems lixy
Z I
CH]-Cll-CH] 0.00 -1.0
Z Z
I d-ll CH]-Cll-R -0.20 +0.40
Z 0: I R-Cll-R -0.40 +0.20
Z 0: I CE3-Cll-CE2X +0.20 monosub. -0.20
axial E -0.45 Z I
CH]-Cll-CH=CHz +0.40 equal. H +0.25 Z
0: I CEl-Cll-CbHs +1.15 0.00
Z 0: I R-Cll-C,H5 +0.90 0.00
C6HS
I From Table B.2b, 8 2.89 for CH3 -CH -CH3 .
From Table B.2c, Lixy 0.00 for CH3• ~xy = 0.40 for CH=CH2•
C6H, I .-Therefore, 8 CH3-CH-CH=CH2 = 2.89 0.00 +
0.40 = 3.29 (Found: 8 3.44).
APPENDIX c 193
APPENDIX C CHEMICAL SHIFTS IN ALICYCLIC AND HETEROCYCLIC RINGS
TABLE C.1 Chemicals Shifts in Alicyclic Rings.
\! D 0 0 0.22 1.96 1.51 1.44
° ° ° ° ° 6238 A 1.96u'.03 6 200 6222
1.65 2.02 -1.8
~1.8
TABLE C.2 Chemical Shifts in Heterocyclic Rings.
2.54
V
1.62 \7 N Hom
2.27
V
H 2.38
[J 2.23 3.54
01.85
3.75
°
H 2.01
R 0J X 3.9-4.1
H ° 4.75-4.90
5.90< I OJ) ° ~
° 30{~
°
2.08n 4.38
2.31 l (0
°
0 1.51
3.52
° 1.50
0 1.50
2.74 N H 1.84
02.23
3.00 S O2
COi4.70
1.68 ° 3.80
1.62
1.62(l4.06
2.27 yO °
0 1.78
° C>30 -1.94
~1.52 ~1.52
194 CHAPTER 3 PROTON NMR SPECTROMETRY
CHEMICAL SHIFTS IN UNSATURATED APPENDIX D AND AROMATIC SYSTEMS
(See Table D.l)
8H = 5.25 +
For example, the chemical shifts of the alkene protons in
are calculated:
C6H5gelll
OR,rans
ORge;/I C6H51ml1s
TABLE D.1 Substituent Constants (Z) for Chemical Shifts of Substituted Ethylenes.
a Alkyl ring indicates that the double bond is part of the ring
1.35 ~1.28
1.18 ~0.1O
trans
1.21
0.35
0.99
-1.28 ~1.05
-0.67 ~0.10
0.03 0.55
1.31
-0.81
-0.04 0.95
I'The Z factor for the conjugated substituent is used when either the substituent or the double bond is further conjugated with other groups. Source: Pascual c.. Meier,]., and Simon, W. (1966) Helv. Chim. Acta, 49, 164.
5.25 0.07
85.32
5.25 1.08
i5 6.33
TABLE 0.2 Chemical Shifts of Miscellaneous Alkenes
R=C~OCH3 ~-6--,------------1-.9-7 ------------2.-12----') HI. R H C R H,C R
>=< 3>=< J>=< H3C CH3 H CH3 H,C H
1.73 1.95 5.98 1.93 1.84 5.62
CH2 3.92
H,C,2.00jl . 1.06 CH2 OSlMe3
, 1 /I02 Ry T H2
5.70H H6.50
5.80
1.
650 2.150 5
.92 o~
1.96 ~ ~ // 5.59 7.36
2.02
R = C(=O)CH3 R OC(=O)CH3
&05 a 1.900 60
0.92
6.4n
oACH 3
2.13
5.95 2.28
2.20 7.71 Q 9
6.88
? 66 6.10 ~. 5.93
o 0
~o 6.05 ¢o} 1 1 6.72
6.75
5.78
0 4.43
o
1~090 I 4.65 02
.
66
4.63 003
.341
4.83
! 1 1 6.16 ~ 6.83 3.97 0 6.37 0 0
CH2Ph 0
6.94
U.40 '-':::::5.89 1.41
o 0 H
4.53
7.28
7.50
7.53 7.72
TABLE 0.3 Chemical Shifts of Alkyne Protons
HC=CR HC=C-C=CR HC=C-Ph
1.73-1.88 1.95 2.71-3.37
piperitone
HC-C-COH HC-CH
TABLE 0.4 Chemical Shifts of Protons on Fused Aromatic
7.81
co~
I 7,46 § §
7.65
8.69
8.31 7.91
cco~ ~
I 7.39 § § §
linalool
2.23 1.80 2.60-3.10
8.64
7.64 ;/
~ 5.60
(y-terpinene
7.65 8.01
APPENDIX D 195
196 CHAPTER 3 PROTON NMR SPECTROMETRY
CHART D.1 CHEMICAL SHIFTS OF PROTONS ON MONOSUBSTITUTED BENZENE RINGS
(I The benzene ring proton is at I) 7.27, from which the shift increments are calculated as shown at the end of Section 3.4. b OTS p-toluenesulfonyloxy group.
APPENDIX E 197
TABLE 0.5 Chemical Shifts of Protons on Heteroaromatic Rings
-0 3.88
6.63
I ~ 7.24 7.83
o
o 7.10
![)7.30 S
H~O (;o~ 9.92 3.88
7.68~ S 7.66~ S
7.22 7.78 6.91 7.40
-0 3.92
7.43 / ~
7.15 7.98 S
o
H2)0 °6~ 6.22 9.45 386 o 6.68 7.32 6.57 ~ 7 .. .4~ N ;r NH ~ H -8.0 - -11.0 NIl
h TIle residual proton consists of one proton of each kind in an otherwise completely deuterated molecule. For example, deuterated acetic acid has two different kinds of residual protons: CD2H-COOD and CD 3-COOH.TIle CD2H proton. coupled to two D nuclei is at 02.03 with a multiplicity of 5 (i.e., 2111 I 2 x 2 XII = 5). The carboxylic proton is a singlet at 0 11.53. , DSS is 3-trimethyJsilyJ)-I-propane sulfonic acid, sodium salt. TSP is sodium-3-trimethylpropionate-2,2,3.3-d4• Both are reference standards used in aqueous solutions.
APPENDIX I 203
APPENDIX I PROTON NMR CHEMICAL SHIFTS OF AIVIINO ACIDS IN D20
CH stretch, several peaks Overtone and combination bands Aromatic ring stretching (four bands) Out-of-plane CH deformations (one or two
bands depending on substitution) Ring deformations (two bands)
N=N=N stretch
C-Br stretch CH stretch; several bands
CH3 deformations
N=C=N antisym stretch
C=O stretch
OH stretch (monomer, dil soln) H-bonded OH stretch (solid and liquid states) C=O stretch of monomer (dil soln) C=O stretch of dimer (solid and liquid states) 960-910 (s) C-OH deformation O-C=O bend C-C=O bend
C-CI stretch
Ring deformation
TABLE 8-2 An Alphabetical Listing of Some Functional Groups and Classes of Compounds with Their Absorption Frequencies in the Infrared-cont'd
Groups or Class
Diazonium salts -N=N
#0 Esters R-C
7
"oR' Ethers -C-O-C-
Fluoroalkyl -CF3' -CH2-, etc.
Isocyanates -N=C=O
Isothiocyanates -N=C=S
Ketones R\
C=O R/
Lactones
Methyl -CH3
Methylene -CH 2 -
Naphthalenes
Nitriles -C=N
Nitro -N02
Oximes =NOH
Phenols Ar-OH
Frequencv Ranges (em-I) and Intensities *
2300-2240 (s)
1765-1720 (vs) 1290-1180 (vs) 645-575 (s)
1280-1220 (s) 1140-1110 (vs) 1275-1200 (vs) 1250-1170 (s) 1050-1000 (s)
1400-1000 (vs)
2280-2260 (vs)
2140-2040 (vs, br) 1725-1705 (vs) 1700-1650 (vs) 1705-1665 (s)
and 1650-1580 (m)
1850-1830 (s) 1780-1770 (s) 1750-1730 (s)
2970-2850 (s) 2835-2815 (s) 2820-2780 (s) 1470-1440 (m) 1390-1370 (m-s)
2940-2920 (m) and 2860-2850 (m)
3090-3070 (m) and 3020-2980 (m)
1470-1450 (m)
645-615 (m-s) and 545-520 (s)
490-465 (variable)
2260-2240 (w) 2240-2220 (m)
580-530 (m-s)
1570-1550 (vs) and 1380-1360 (vs)
1480-1460 (vs) and 1360-1320 (vs)
920-830 (m) 650-600 (s) 580-520 (m) 530-470 (m-s)
3600-3590 (vs) 3260-3240 (vs) 1680-1620 (w)
720-600 (s, br) 450-375 (w)
3100-3000 (w-m) 2000-1700 (w)
Assignment and Remarks
N=N stretch
C=O stretch C-O-C antisym stretch O-C-O bend
C-O-C stretch in alkyl aryl ethers C-O-C stretch in dialkyl ethers C-O-C stretch in vinyl ethers C-O-C stretch in cyclic ethers R(alkyl)-C-O stretch in alkyl aryl ethers
C-F stretch
N=C=O stretch
C=N=S antisym stretch
C=O stretch in saturated aliphatic ketones C=O stretch in aromatic ketones C=O and C=C stretching in
a,j3-unsaturated ketones
C=O stretch in j3-lactones C=O stretch in y-Iactones C=O stretch in 8-lactones
CH stretch in C-CH3 compounds CH stretch in methyl ethers (0-CH3) CH stretch in N-CHa compounds CH3 antisym deformation CH3 sym deformation
CH stretches in alkanes
CH stretches in alkenes
CH2 deformation
In-plane ring bending
Out-of-plane ring bending
C=N stretch in aliphatic nitriles C=N stretch in aromatic nitriles C-C-CN bend
N02 stretches in aliphatic nitro compounds
N02 stretches in aromatic nitro compounds
C-N stretch N02 bend in aliphatic compounds N02 bend in aromatic compounds N02 rocking
-OH in alcohols and phenols NH2 in aromatic amines, primary amines and amides
-OH in alcohols and phenols -NH2 in primary amides -OH in oximes =CH in acetylenes -NH in secondary amides
-NH2 in primary amides -NH3 in amino acids -OH in carboxylic acids =CH in aromatic and unsaturated
hydrocarbons -CH3 and -CH 2- in aliphatic
compounds -CH3 attached to 0 or N -CHO in aldehydes -NH/ in amine hydrohalides -OH in phosphorus oxyacids -SH in alkyl mercaptans -PH in phosphines N-N in diazonium salts N=C=O in isocyanates C=N in nitriles C=C in alkynes (disubstitution) C=N in thiocyanates N=<;: in Lsonitriles N=N=N in azides C=C in alkynes (monosubstitution) Substituted benzene rings
C=C=C in allenes C=O in carbonyl compounds C=O in ~-Iactones C=O in anhydrides C=O in acid halides
C=O in y-Iactones C=O in anhydrides C=O in a-keto esters C=O in I:l-Iactones C=O in esters
C=O in aldehydes
C=O in ketones
C=O in carboxylic acids C=N in oximes C=O and NH2 in primary amides
C=O in ureas C=C in alkenes, etc. C=O in secondary amides C=O in benzophenones C=O in primary amides C=O in tertiary amides
Assignment and Remarks
OH stretch (dil soln) NH stretch (dil soln)
OH stretch (solids and liquids) NH2 antisym stretch (solids) O-H stretch =C-H stretch NH stretch (solids); also in polypeptides
CH stretching modes Overtone of CH bending (Fermi resonance) NH stretching modes Associated OH stretching S-H stretch; strong in Raman P-H stretch; sharp peak N=N stretch, aq soln N=C=O antisym stretch C=N stretch C=C stretch; stong in Raman C=N stretch N C stretch N=N=N antisym stretch C=C stretch Several bands from overtones and
combinations C=C=C antisym stretch C=O stretch C=O stretch C=O antisym stretch; part of doublet C=O stretch; lower for aromatic acid
halides C=O stretch C=O sym stretch; part of doublet C=O stretch; enol form C=O stretch C=O stretch; 20 cm1 lower if
unsaturated C=O stretch; 30 cm- 1 lower if
unsaturated C=O stretch; 20 cm- 1 lower if
unsaturated C=O stretch; fairly broad C=N stretch; also imines Two bands from C=O stretch and NH2
deformation c=o stretch; broad band C=C stretch C=O stretch (Amide I band) C=O stretch C=O stretch (Amide I band) C=O stretch
Continued
194 Part II I Vibrational Spectroscopy
TABLE 8·3
A Numerical Listing of Wavenumber Ranges in Which Some Functional Groups and Classes of Compounds Absorb in the Infrared-cont'd
Range (cm~l) and Intensity'"
1655-1635 (vs) 1650-1620 (w-m) 1650-1580 (m-s) 1640-1580 (s) 1640-1580 (vs) 1620-1610 (s)
1615-1590 (m) 1615-1565 (s) 1610-1580 (s)
1610-1560 (vs)
1590-1580 (m) 1575-1545 (vs) 1565-1475 (vs) 1560-1510 (s) 1550-1490 (s) 1530-1490 (s) 1530-1450 (m-s) 1515-1485 (m) 1475-1450 (vs) 1465-1440 (vs) 1440-1400 (m) 1420-1400 (m) 1400-1370 (m)
1400-1310 (s)
1390-1360 (vs) 1380-1370 (s) 1380-1360 (m) 1375-1350 (s) 1360-1335 (vs) 1360-1320 (vs) 1350-1280 (m-s) 1335-1295 (vs) 1330-1310 (m-s)
1300-1200 (vs) 1300-1175 (vs)
1300-1000 (vs) 1285-1240 (vs) 1280-1250 (vs)
1280-1240 (m-s)
1280-1180 (s) 1280-1150 (vs) 1255-1240 (m)
1245-1155 (vs) 1240-1070 (s-vs) 1230-1100 (s) 1225-1200 (s) 1200-1165 (s) 1200-1015 (vs) 1170-1145 (s) 1170-1140 (s)
Group and Class
C=O in p-ketone esters N-H in primary amides NHz in primary amines NH3+ in amino acids C=O in p-diketones C=C in vinyl ethers
Benzene ring in aromatic compounds Pyridine derivatives NHz in amino acids
COO~ in carboxylic acid salts
NHz primary alkyl amide N02 in aliphatic nitro compounds NH in secondary amides Triazine compounds N02 in aromatic nitro compounds NH3 + in amino acids or hydrochlorides N=N-O in azoxy compounds Benzene ring in aromatic compounds CHz in aliphatic compounds CH3 in aliphatic compounds OH in carboxylic acids C-N in primary amides tert-Butyl group
COO- group in carboxylic acid salts
502 in sulfonyl chlorides CH3 in aliphatic compounds Isopropyl group NOz in aliphatic nitro compounds 502 in sulfonamides N02 in aromatic nitro compounds N=N-O in azoxy compounds 502 in sulfones CF3 attached to a benzene ring + ~
N-O in pyridine N-oxides P=O in phosphorus oxyacids and
phosphates C-F in aliphatic fluoro compounds Ar-O in alkyl aryl ethers Si-CH3 in silanes C-C ,,/ in epoxides o .
C-N in aromatic amines C-O-C in esters, lactones tert-Butyl in hydrocarbons
S03H in sulfonic acids C-O-C in ethers C-C-N in amines C-O-C in vinyl ethers S02CI in sulfonyl chlorides C-OH in alcohols S02NHz in sulfonamides 502- in sulfones
Assignment and Remarks
C=O stretch; enol form NH deformation (Amide II band) NH2 deformation NH3 deformation C=O stretch; enol form C=C stretch; doublet due to rotational
isomerism Ring stretch; sharp peak Ring stretch; doublet NHz deformation; broad band
/;J -C: - antisym stretch
\. o NH2 deformation (Amide II band) NOz antisym stretch NH deformation (Amide II band) Ring stretch; sharp band NOz antisym stretch NH3 + deformation N=N-O antisym stretch Ring stretch, sharp band CHz scissors vibration CH3 antisym deformation In-plane OH bending C-N stretch (Amide III band) CH3 deformations (two bands)
850-550 (m) 830-810 (vs) 825-805 (vs) 820-800 (s) 815-810 (s) 810-790 (vs) 800-690 (vs) 785-680 (vs) 775-650 (m) 770-690 (vs) 760-740 (s) 760-510 (s) 740-720 (w-m)
730-665 (s) 720-600 (s, br) 710-570 (m) 700-590 (s) 695-635 (s) 680-620 (s) 680-580 (s) 650-600 (w) 650-600 (s) 650-500 (s)
650-500 (s) 645-615 (m-s) 645-575 (s) 640-630 (s) 635-605 (m-s) 630-570 (s)
Group and Class
C=S in thiocarbonyl compounds C-O-C in aliphatic ethers C-OH in secondary or tertiary
alcohols C-NH2 in primary aliphatic amines Si-O-Si in siloxanes S03H in sulfonic acids CH-OH in cyclic alcohols CHz-OH in primary alcohols S=O in alkyl sulfoxides P-O-C in organophosphorus
compounds Carbon ring in cyclic compounds CH={;H_ in vinyl compounds CH=(:H-- in trans disubstituted alkenes CH=(:H. in vinyl compounds
l CH =C in vinylidenes
2 \
R' 1 ,2,4-trisu bstituted benzenes R-NH2 primary amines Si-C in organosilicon compounds 1 ,3,5-trisu bstituted benzenes Si-CH3 in silanes
l CH=C in trisubstituted alkenes
\' C-CI in chloro compounds p-disubstituted benzenes 1 ,2,4-trisu bstituted benzenes Triazines CH=CH2 in vinyl ethers 1,2,3,4-tetrasubstituted benzenes m-disubstituted benzenes 1,2,3-trisubstituted benzenes C-S in sulfonyl chlorides Monosubstituted benzenes o-disubstituted benzenes C-CI alkyl chlorides -(CHZ)n- in hydrocarbons
CH=CH in cis disubstituted alkenes Ar-OH in phenols C-S in sulfides O-C=O in carboxylic acids C-C-CHO in aldehydes C-OH in alcohols C=C-H in alkynes S-C=N in thiocyanates NOz in aliphatic nitro compounds Ar-CF3 in aromatic trifluoro-methyl
compounds C-Br in bromo compounds Naphthalenes O-C-O in esters =CHz in vinyl compounds pyridines N-C=O in amides
Assignment and Remarks
C=S stretch; strong in Raman C-O-C antisym stretch C-O stretch
depends on chain length CH out-of-plane deformation OH out-of-plane deformation C-S stretch; strong in Raman O-C=O bending C-C-CHO bending C-O-H bending C=C-H bending S-C stretch; strong in Raman NOz deformation CF3 deformation (two or three bands)
C-Br stretch In-plane ring deformation O-C-O bend =CH2 twisting In-plane ring deformation N-C=O bend
Continued
196 Part II / Vibrational Spectroscopy
TABLE 8-3
A Numerical Listing of Wavenumber Ranges in Which Some Functional Groups and Classes of Compounds Absorb in the Infrared-cont'd
Range (em-I) and Intensity*
630-565 (s) 615-535 (s) 610-565 (vs) 610-545 (m-s) 600-465 (s) 580-530 (m-s) 580-520 (m) 580-430 (s) 580-420 (m-s)
570-530 (vs) 565-520 (s) 565-440 (w-ml 560-510 (s)
560-500 (s)
555-545 (s) =CH2 in vinyl compounds 550-465 (s) 545-520 (s) 530-470 (m-s) 520-430 (m-s) 510-400 (s) 490-465 (variable) 440-420 (s) 405-400 (s)
TABLE 8·4
Group and Class
C-co-C in ketones C=O in amides S02 in sulfonyl chlorides S02 in sulfones C-I in iodo compounds C-C-CN in nitriles N02 in aromatic nitro compounds Ring in cycloalkanes Ring in benzene derivatives
S02 in sulfonyl chlorides C-C=O in aldehydes CnH2n + 1 in alkyl groups C-C=O in ketones
j,P -( - in amino acids
""° =CH2 twisting C-C=O in carboxylic acids Naphthalenes N02 in nitro compounds C-O-C in ethers C-N-C in amines Naphthalenes CI-C=O in acid chlorides S-C=N in thiocyanates
Assignment and Remarks
C-co-C bend C=O out-of-plane bend S02 deformation S02 scissoring C-I stretch C-C-CN bend N02 deformation Ring deformation In-plane and out-of-plane ring
deformations (two bands) S02 rocking C-C=O bend Chain deformation modes (two bands) C-C=O bend
l -c: rocking \:.
° C-C=O bend In-plane ring deformation N02 rocking C-O-C bend C-N-C bend Out-of-plane ring bending CI-C=O in-plane deformation S-C=N bend
Characteristic Frequencies of Functional Groups in the Raman Spectra of Complex Molecules