Abstract
The Ce 4+ oxidation of Mn 2+ in acetic acid in the presence of 2,2′-bipyridine gives the unsymmetrical complex [Mn 2O(OAc) 2(H 2O)(NO 3)(bpy) 2](ClO 4)·CH 3COOH. The crystal structure of the complex shows the coordination of both nitrate and water to the metal ion. Each metal centre exhibits Jahn-Teller distortion and results in two types of MnO OAc bonds. The formation of different high-valent manganese complexes by Ce 4+ oxidation under different conditions is discussed in the light of possible disproportionation and proton-coupled electron transfer reactions. The mode of (pseudo) Jahn-Teller distortion seen in manganese(III,III) complexes having the Mn 2O(OAc) 2 2+ core is reviewed.
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