- Home
- CHEM 412 Homework 4

## Product Description

page: 1. Molecular orbital diagrams

Answer the following questions for the following three Ni(II) complexes:

(i)

octahedral [Ni(H2O)6]2+

(ii)

tetrahedral [NiCl4]2(iii)

square-planar [Ni(CN)4]2(A) Draw for each complex qualitatively the relative energies of the five d-orbitals and

indicate the d-electrons with arrows, i.e. ↑ and ↓. Please indicate the type of the d-orbitals

(e.g. dxy etc for the orbitals). (B) Which complex(es) will have a magnetic moment of ∼2.8 μB? Briefly explain your

answer. 2. Molecular orbital diagrams

Why is CO a strong field ligand? Use molecular orbital diagrams to illustrate your answer. 3. Term symbols

Calculate the number of microstates for all dn configurations (i.e. n = 0 – 10). 4. Term symbols

The table below gives the various free ion terms for the various dn configurations. Pick a dn

configuration of your choice (with n between 3 and 7) and calculate the number of

microstates for all free ion terms of that dn configuration. Show that the sum of the

microstates you obtain by this method equals the number you obtained in the previous

question. 5. Term symbols

What are the term symbols for the ground states of complexes with dn configurations (n =

1-9) with (a) octahedral symmetry and (b) tetrahedral symmetry. Assume that all

complexes are in the high-spin configuration.

Splitting of a D-term and an F-term in an octahedral ligand field. Note that the energetic

order can be inverted, depending on the dn electron configuration and/or geometry. 6. Tanabe Sugano diagrams

(a) Please explain the discontinuity indicated by the black vertical line in the Tanabe

Sugano diagram for d5. Consider the spin states of the various terms for your answer.