Catalytic O2 Evolution from Water Induced by Adsorption of [(OH2)(Terpy)Mn(μ-O)2Mn(Terpy)(OH2)]3+ Complex onto Clay Compounds
- 11 June 2004
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 126 (26), 8084-8085
- https://doi.org/10.1021/ja039780c
Abstract
Water oxidation to evolve O2 in photosynthesis is catalyzed by an enzyme whose active site contains a μ-oxo-bridged manganese core. Catalytic O2 evolution has been difficult to establish by manganese−oxo complexes in homogeneous aqueous solutions. The reaction of [(OH2)(terpy)MnIII(μ-O)2MnIV(terpy)(OH2)]3+ (terpy = 2,2‘:6‘,2‘ ‘-terpyridine) (1) with a CeIV oxidant leads to the decomposition of 1 to the permanganate ion without O2 evolution in an aqueous solution but catalytically produces O2 from water when 1 is adsorbed on clay compounds. 18O-labeling experiments showed that the oxygen atoms in O2 originate exclusively from water. Catalysis of O2 evolution requires cooperation of 2 equiv of 1 adsorbed on clay compounds.Keywords
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