PubAg

Main content area

Fragments of Layered Manganese Oxide Are the Real Water Oxidation Catalyst after Transformation of Molecular Precursor on Clay

Author:
Najafpour, M. M., Moghaddam, Atefeh N., Dau, Holger, Zaharieva, Ivelina
Source:
Journal of the American Chemical Society 2014 v.136 no.20 pp. 7245-7248
ISSN:
1520-5126
Subject:
Cyanobacteria, X-ray absorption spectroscopy, catalysts, clay, kinetics, manganese, manganese oxides, models, montmorillonite, oxidants, oxidation, oxygen production
Abstract:
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.
Agid:
5391516