The diiron complex Fe2(DPhF)3 (DPhF = diphenylforamidinate) has seven unpaired electrons...

The diiron complex Fe₂(DPhF)₃ (DPhF = diphenylforamidinate) has seven unpaired electrons. Calculations indicate that the order of energies of the molecular orbitals resulting from d orbital interactions is different from Figure 15.9: in order of increasing energy.

a. What are the formal oxidation states of the iron atoms?

b. Account for the seven unpaired electrons. (C. M. Zall, D. Zherebetskyy, A. L. Dzubak, E. Bill, L. Gagliardi, C. C. Lu, Inorg. Chem., 2012, 51, 728.)