ESR of an oxidized manganese binuclear cluster: a possible model of the highest oxidized state of the oxygen-evolving complex of photosynthesis
Abstract
The oxidation of the manganese-bipyridyl dinuclear µ-oxo-complex leads to a paramagnetic species with 170 mT wide, multiline ESR spectrum visible below 15 K, consistent with a spin-exchange coupled MnIV–MnIV cluster; this valence-state being similar to that of the extremely oxidized state of the oxygen-evolving complex in photosynthesis.