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Tuning the Electronic Structure of Halidobis(o-imino-benzosemiquinonato)iron(III) Complexes
Hyungphil Chun1, Thomas Weyhermüller1, Eckhard Bill1
1Max-Planck-Institut für Strahlenchemie Stiftstrasse 34-36, 45470 Mülheim an der Ruhr (Germany) Fax: (+49) 208-306-3952.
Abstract:
The halide ligand determines the ground state for the complexes 1. The chloride complex has a pure St =3/2 state, the iodide complex a pure St =1/2 state, and the bromide complex contains both spin-state isomers (St =3/2 and 1/2) in a 1:1 ratio. Strong intramolecular antiferromagnetic exchange coupling between the FeIII ion, which in the chloride complex has a high-spin (SFe = 5/2) state and in the iodide complex an intermediate-spin (SFe =3/2) state, and the two π radicals leads to observed ground states, St .
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