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Science 5 March 1999:
Vol. 283. no. 5407, pp. 1524 - 1527
DOI: 10.1126/science.283.5407.1524
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Reports

A Functional Model for O-O Bond Formation by the O2-Evolving Complex in Photosystem II

Julian Limburg, 1 John S. Vrettos, 1 Louise M. Liable-Sands, 2 Arnold L. Rheingold, 2 Robert H. Crabtree, 1* Gary W. Brudvig 1*

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.

1 Department of Chemistry, Yale University, Post Office Box 208107, New Haven, CT 06520-8107, USA.
2 Crystallography Laboratory, Department of Chemistry, University of Delaware, Newark, DE 19716, USA.
*   To whom correspondence should be addressed. E-mail: robert.crabtree{at}yale.edu; gary.brudvig{at}yale.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Consecutive Thermal H2 and Light-Induced O2 Evolution from Water Promoted by a Metal Complex.
S. W. Kohl, L. Weiner, L. Schwartsburd, L. Konstantinovski, L. J. W. Shimon, Y. Ben-David, M. A. Iron, and D. Milstein (2009)
Science 324, 74-77
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Water oxidation chemistry of photosystem II.
G. W Brudvig (2008)
Phil Trans R Soc B 363, 1211-1219
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Why did Nature choose manganese to make oxygen?.
F. A Armstrong (2008)
Phil Trans R Soc B 363, 1263-1270
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Biological solar energy.
J. Barber (2007)
Phil Trans R Soc A 365, 1007-1023
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Molecular recognition in the selective oxygenation of saturated C-H bonds by a dimanganese catalyst..
S. Das, C. D. Incarvito, R. H. Crabtree, and G. W. Brudvig (2006)
Science 312, 1941-1943
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Science. ISSN 0036-8075 (print), 1095-9203 (online)