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Fragments of Layered Manganese Oxide Are the Real Water Oxidation Catalyst after Transformation of Molecular Precursor on Clay
- Najafpour, M. M., Moghaddam, Atefeh N., Dau, Holger, Zaharieva, Ivelina
- Journal of the American Chemical Society 2014 v.136 no.20 pp. 7245-7248
- Cyanobacteria, X-ray absorption spectroscopy, catalysts, clay, kinetics, manganese, manganese oxides, models, montmorillonite, oxidants, oxidation, oxygen production
- 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.