A functional model for O-O bond formation by the O2-evolving complex in photosystem II

Julian Limburg, John S. Vrettos, Louise M. Liable-Sands, Arnold L. Rheingold, Robert H. Crabtree, Gary W. Brudvig

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Abstract

The formation of molecular oxygen from water in photosynthesis is catalyzed by photosystem II at an active site containing four manganese ions that are arranged in di-μ-oxo dimanganese units (where μ is a bridging mode). The complex [H2O(terpy)Mn(O)2Mn(terpy)OH2(NO3)3 (terpy is 2,2':6',2-terpyridine), which was synthesized and structurally characterized, contains a di-μ-oxo manganese dimer and catalyzes the conversion of sodium hypochlorite to molecular oxygen. Oxygen-18 isotope labeling showed that water is the source of the oxygen atoms in the molecular oxygen evolved, and so this system is a functional model for photosynthetic water oxidation.

Original languageEnglish
Pages (from-to)1524-1527
Number of pages4
JournalScience
Volume283
Issue number5407
DOIs
Publication statusPublished - Mar 5 1999

ASJC Scopus subject areas

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    Limburg, J., Vrettos, J. S., Liable-Sands, L. M., Rheingold, A. L., Crabtree, R. H., & Brudvig, G. W. (1999). A functional model for O-O bond formation by the O2-evolving complex in photosystem II. Science, 283(5407), 1524-1527. https://doi.org/10.1126/science.283.5407.1524