7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 1/20
KIMIA ANORGANIK III
CRYSTAL FIELD THEORY
(TEORI MEDAN KRISTAL)
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 2/20
COORDINATE COVALENT
BONDS AND GEOMETRY
Valence Bond Theoryversus
Crystal Field Theory
Valence Bond hybridization
Octahedral d2sp3
Tetrahedral sp3
Square planar dsp2
“low spin” and “high spin” complexes
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 3/20
BENTUK-BENTUK ORBITAL d
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 4/20
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 5/20
The 6 ligands in an octahedral crystal field
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 6/20
Formation of d2sp3 orbitals
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 7/20
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 8/20
Draw the d -orbital splitting diagrams for theoctahedral complex ions of each of thefollowing.
a. Fe2+ (high and low spin)b. Fe3+ (high spin)c. Ni2+
d. Zn 2+
e. Co2+
(high and low spin)
How many unpaired electrons are in thefollowing complex ions?
a. [Ru(NH3)62+
(low-spin case)b. Fe(CN)6
3- (low-spin case)c. Ni(H2O)6
2+
d. V(en)33-
e. CoCl42-
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 9/20
The 4 ligands in a tetrahedral crystal field
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 10/20
Tetrahedral crystal field splitting energy
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 11/20
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 12/20
The d
orbitalenergy
level
diagram
for an
octahedralcomplex
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 13/20
Free Coorbitals
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 14/20
The d
energy
diagrams
for square,planar,
and linear
complexes
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 15/20Spectra of emerald and ruby
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 16/20
Absorption and emission of light
by Cr (III) complex ions
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 17/20
Spectrochemical Series of Ligands
Wavelength in nm Crystal Fieldof Peak in Spectrum Splitting Energy
Ligand of Co(NH3)4 X * (nm) for Co(NH3)5 X (kJ/mol)COCN- 440 272-NO2
- 458 261en-NC-
NH3 475 252-NCS- 496 241OH2 490 244C2O4
2-
-ONO- 491 244OH- 503 238
-ONO2- 500 239F- 510 235Cl- 533 224-SCN- S2-
Br - 550 217I- 580 206*This wavelength is that at which there is a maximum absorption of light in thes ectrum of the Cobalt III com lex ion.
Pairing
Energy
Large
Small
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 18/20
The complex ion NiCl42- has two unpaired
electrons, while Ni(CN)42- is diamagnetic.
Propose structures for these two complex ions.
Tetrahedral complexes of Co2+ are quite
common. Use a d-orbital splitting diagram to
rationalize the stability of Co2+
tetrahedralcomplex ions.
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 19/20
The compound Ni(H2O)6Cl2 is green, while
Ni(NH3)6Cl2 is purple. Predict the predominant
color of light absorbed by each compound. Which
compound absorbs light with the shorter
wavelength? Predict in which compound is
greater and whether H2O or NH3 is a stronger field
ligand. Do your conclusions agree with thespectrochemical series?
7/16/2019 TEORI MEDAN KRISTAL (CRYSTAL FIELS THEORY).ppt
http://slidepdf.com/reader/full/teori-medan-kristal-crystal-fiels-theoryppt 20/20
The complex ion Fe(CN)63- is paramagnetic with one
unpaired electron. The complex ion Fe(SCN)63- has
five unpaired electrons. Where does SCN- lie in thespectrochemical series relative to CN-?