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Tuning the Electronic Structure of Halidobis(o-imino-benzosemiquinonato)iron(III) Complexes

2001; Wiley; Volume: 40; Issue: 13 Linguagem: Inglês

10.1002/1521-3773(20010702)40

1521-3773

Hyungphil Chun, Thomas Weyhermüller, Eckhard Bill, Karl Wieghardt,

Metal-Catalyzed Oxygenation Mechanisms

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.