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Catalytic O2 evolution from water induced by adsorption of [OH2)(terpy)Mn(mu-O)2Mn(terpy)(OH2)]3+ complex onto clay compounds.

Authors
  • Yagi, Masayuki
  • Narita, Komei
Type
Published Article
Journal
Journal of the American Chemical Society
Publication Date
Jul 07, 2004
Volume
126
Issue
26
Pages
8084–8085
Identifiers
PMID: 15225027
Source
Medline
License
Unknown

Abstract

Water oxidation to evolve O2 in photosynthesis is catalyzed by an enzyme whose active site contains a mu-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(mu-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.

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