Mechanism for photosynthetic O2 evolution.

G. W. Brudvig, R. H. Crabtree

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172 Citations (Scopus)


We present a mechanism for photosynthetic O2 evolution based on a structural conversion of a Mn4O6 "adamantane"-like complex to a Mn4O4 "cubane"-like complex. EPR spectral data obtained from the S2 state of the O2-evolving complex are characteristic of a Mn4O4 cubane-like structure. Based on this structure for the manganese complex in the S2 state as well as a consideration of the other evidence available on the natural system and the coordination chemistry of manganese, structures are proposed for the five intermediate oxidation states of the manganese complex. A molecular mechanism for the formation of an O--O bond and the displacement of O2 from the S4 state is easily accommodated by the proposed model. The model is discussed in terms of recent EPR, x-ray, and UV spectral data obtained from the manganese site in the photosynthetic O2-evolving complex.

Original languageEnglish
Pages (from-to)4586-4588
Number of pages3
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number13
Publication statusPublished - Jul 1986

ASJC Scopus subject areas

  • General

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