Arkansas State University Department of Chemistry and Physics

1. Calculate the CFSE for both high spin and low spin octahedral complexes of Co(gly)₆^3-. Which is preferred?

2. Determine whether the Co⁺² complex with phenanthroline will prefer to be octahedral or tetrahedral based on CFSE.

3. Draw the M.O. diagram for an octahedral complex with six sigma donor ligands.  Draw the electrons for a d⁵ high spin complex.

4. What are Jahn-Teller distortions?  Where do they come from? Show 'z - in' and 'z-out' configurations.  Which is preferred for a d⁹ configuration?

5. Draw the expected splitting for a Cu(ox)₃^4- complex.  Would the splitting pattern change if two of the Cu-O bond lengths were longer than the other four?

6. Using the Tanabe-Sugano diagrams, give the ground states for the free metal, high spin and low spin d⁵ complexes.  What are the first excited state for each of these?  List all possible transitions.  Draw the microstates of the ground state for each of the three species.

7. Determine the spin state for each of the following:

a)  Fe(OH₂)₆³⁺

b)  V(CN)₆^3-

c)  CuI₄^2-

d)  RuCl₆^4-

8. Draw the expected splitting of the d orbitals for a trigonal bipyramidal geometry

9. Draw the high spin and low spin configurations for a d⁴ ion in a tetrahedral field.  Which is preferred and why?

10. Determine the CFSE for the tetrahedral Co⁺² complex with methylamine.

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