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A binuclear manganese molecular complex (OH2)(terpy)Mn(μ-O)2Mn(terpy)(OH2)(3+) (1) is the most prominent structural and functional model of the water-oxidizing Mn complex operating in plants and cyanobacteria. Supported on montmorillonite clay and using Ce(IV) as a chemical oxidant, 1 has been reported to be one of the best Mn-based molecular catalysts toward water oxidation. By X-ray absorption spectroscopy and kinetic analysis of the oxygen evolution reaction, we show that (OH2)(terpy)Mn(μ-O)2Mn(terpy)(OH2)(3+) is transformed into layered type Mn-oxide particles which are the actual water oxidation catalyst.
Najafpour et al. (Mon,) studied this question.