The preparation and properties of the oxide-bridged tetranuclear complex [Mn4O2(OAc)6(bpy)2](1)(bpy = 2,2′-bipyridine) are reported; the complex has an average metal oxidation state of +2.5, corresponding to the putative S–1 oxidation state of the photosynthetic water oxidation centre.
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Christmas et al. (1987) studied this question.