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Nucleophilic water attack is not a possible mechanism for O-O bond formation in photosystem II
Stockholm University, Faculty of Science, Department of Organic Chemistry.
Number of Authors: 1
2017 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 114, no 19, 4966-4968 p.Article in journal (Refereed) Published
Abstract [en]

Two different types of mechanisms are at present suggested for the O-O bond-formation step in photosystem II. The first one is a coupling between an oxyl radical and a bridging oxo. The second one is a nucleophilic water attack on a terminal oxo (or oxyl) group. In the present short paper, the six most reasonable versions of the latter mechanism have been studied and compared with the oxo-oxyl mechanism. The barriers are found to be much too high for the water attack, and that mechanism can therefore safely be ruled out. The reason is that the protonated peroxide product is always very high in energy.

Place, publisher, year, edition, pages
2017. Vol. 114, no 19, 4966-4968 p.
Keyword [en]
photosynthesis, O-2 formation, mechanism, density functional theory
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-143442DOI: 10.1073/pnas.1617843114ISI: 000400818400045PubMedID: 28438997OAI: oai:DiVA.org:su-143442DiVA: diva2:1107154
Available from: 2017-06-09 Created: 2017-06-09 Last updated: 2017-06-09Bibliographically approved

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Siegbahn, Per E. M.
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