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Magnetic coupling, between dimeric iron

Magnetic coupling, between dimeric iron ions, diiron-oxygen proteins, 43 365-366 Magnetic interactions, 20 134-142 direct cation-cation, 20 139, 140 indirect cation-anion-cation, 20 140-142 Magnetic measurements, 32 58 Magnetic moments... [Pg.169]

Selected Values for Magnetic Coupling between the Dimeric Iron Ions in Iron-Oxygen Proteins... [Pg.366]

The mechanism of MMO including the different states of the iron dimer complex has been reviewed several times [66, 67, 68]. The lowest oxidation state of the diiron complex is Fe2(II,II) which is a loosely bound, ferro-magnetically coupled dimer with a long Fe-Fe distance. This complex, termed O, reacts with O2 to form another complex P, which is normally assigned to an Fe2(III,III) peroxide complex. One or more intermediates in between O and P have been postulated [70]. In the next step, the dioxygen bond is cleaved and an unprecedented Fe2(IV,IV) complex termed Q is formed. The oxidation state assignment was made based on Mbssbauer spectroscopy [71]. Compoimd Q has been suggested to be the active oxidant that attacks methane. [Pg.122]

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