An EXAFS study of bis(μ-oxo) bridged dinuclear manganese coordination compounds as models for the manganese complex of photosystem II

S. Turconi, C. P. Horwitz, Y. Ciringh, S. T. Weintraub, J. T. Warden, J. H.A. Nugent, M. C.W. Evans

Research output: Contribution to journalArticle

Abstract

A complex containing four manganese centres is thought to be the catalytic site of photosynthetic water oxidation. The structure and mechanism of action of this complex are largely unknown. Mn-coordination complexes can be used as models for the manganese complex of Photosystem II(PS II). We report here an X-ray Absorption Spectroscopic study of seven different manganese coordination compounds, six of which are binuclear and contain the structural bis (μ-oxo) unit. In all the compounds, manganese is ligated by 3,3′-17-crown-6-SALPN, providing one crown ether moiety per Mn centre. Alkali or alkaline-earth cations were introduced into this crown-ether moiety in binuclear complexes, bringing the cations (Na+, K+, Ca2+ and Ba2+) into the vicinity (< 4Å) of the manganese. The results are discussed in terms of their relevance to the PSII manganese complex.

Original languageEnglish (US)
Pages (from-to)C2-603-C2-606
JournalJournal De Physique. IV : JP
Volume7
Issue number2 Part 1
DOIs
StatePublished - 1997

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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