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Proton-Coupled Electron Transfer from Tyrosine: A Strong Rate Dependence on Intramolecular Proton Transfer Distance
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Photochemistry and Molecular Science, Chemical Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Photochemistry and Molecular Science.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Photochemistry and Molecular Science, Chemical Physics.
2011 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 133, no 34, 13224-13227 p.Article in journal (Refereed) Published
Abstract [en]

Proton-coupled electron transfer (PCET) was examined in a series of biomimetic, covalently linked Ru(II)(bpy)(3)-tyrosine complexes where the phenolic proton was H-bonded to an internal base (a benzimidazyl or pyridyl group). Photooxidation in laser flash/quench experiments generated the Ru(III) species, which triggered long-range electron transfer from the tyrosine group concerted with short-range proton transfer to the base. The results give an experimental demonstration of the strong dependence of the rate constant and kinetic isotope effect for this intramolecular PCET reaction on the effective proton transfer distance, as reflected by the experimentally determined proton donor-acceptor distance.

Place, publisher, year, edition, pages
2011. Vol. 133, no 34, 13224-13227 p.
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Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-161752DOI: 10.1021/ja203483jISI: 000295551600005OAI: oai:DiVA.org:uu-161752DiVA: diva2:457965
Available from: 2011-11-21 Created: 2011-11-17 Last updated: 2017-12-08Bibliographically approved

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Zhang, Ming-TianHammarstrom, Leif

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