Advanced Inorganic Chemistry
CHEM 4305
Homework Set # 4 Chapters 9-11
Due 4-19 Part 1 of two parts
1. Write the dn configurations for the metal center in the following complexes:
a) Co(en)33+
b) ReF82c) V(acac)2O
d) Hf(BH4)4
2. Write the most common geometry for the following coordination numbers:
Coordination
number
2
3
4
4
5
5
6
7
7
8
8
9
Most Common Geometry
3. Arrange the following ligands in the order they should appear in the spectrochemical
series
i) en
ii)Iiii) Briv) CNv) Ox2vi) H2O
vii) bipy
4. The mean pairing energy for Cr(H2O)62+ is found to be 23,500 cm-1 and the magnitude
of Δo is 13,900 cm-1. Calculate the crystal field stabilization energy (CFSE) and the
number of unpaired electrons (UPE) in the ground state.
Correct
answer(√ )
answer
CFSE (cm-1)
UPE
a.
b.
c.
d.
e.
f.
1260
1260
8340
9600
9600
8340
4
2
2
4
2
4
5. Which of the following form square planar complexes
a) copper(II)
b) platinum (II)
c) cobalt(II)
6. Which of the following compounds do not exhibit Jahn-Teller distortion
a) CrF2
b) Cu(H2O)62+
c) Ti(H2O)63+
d) CoF2
e) V(H2O)62+
7. Problem 9-3
8. Problem 9-12
9. Using the spin selection rules and the Tanabe-Sugano diagram below, estimate the
energy of the three spin-allowed ligand field bands for Cr(H2O)63+. Given: B=695 cm-1
Δo= 17,000 cm-1.
A
B
C
D
E
45,000
20,000
8,000
13,000
17,000
35,000
32,000
14,000
13,052
24,000
25,000
53,000
19,000
13,121
37,000
10. Write the d orbital configurations and use the Tanabe-Sugano diagrams to identify the
ground term of a) low spin [Rh(NH3)6]3+ , b) [Ti(OH2)6]3+ and c) high spin [Fe(OH2)6]3+.
11. The spectrum of [Co(NH3)6]3+ has a very weak band in the red and two moderate
intensity bands in the visible to near UV. How should these transitions be assigned?
12. Why is [FeF6]3- colorless, but [CoF6]3- is colored with only a single band in the visible
spectrum?
13. Problem 11-27