A possible geometry for an eight-coordinate complex ML8 might be a hexagonal bipyramid:...

A possible geometry for an eight-coordinate complex ML₈ might be a hexagonal bipyramid:

a. Predict the effect of the eight ligands on the energies of the d orbitals of a metal M, using the angular overlap model and assuming that the ligands are sigma donors only. [Note: To determine the values of you will need to add two more positions to Table 10.11 .]

b. Assign the symmetry labels of the d orbitals (labels of the irreducible representations).

c. Repeat the calculations in part a for a ligand that can act both as a donor and a π acceptor.

d. For this geometry, and assuming low spin, which dⁿ configurations would be expected to give rise to Jahn–Teller distortions?