Mimicking electron transfer reactions in photosystem II: synthesis and photochemical characterization of a ruthenium(II) tris(bipyridyl) complex with a covalently linked tyrosine.
1997 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 119, no 44, 10720-10725 p.Article in journal (Refereed) Published
In the natural photosynthetic reaction center photosystem II, absorption of a photon leads to photooxidationof the primary electron donor P680, which subsequently retrieves electrons from a tyrosyl residue, functioning as aninterface to the oxygen-evolving manganese complex. In a first step toward mimicking these reactions, we havemade a Ru(II)-polypyridine complex with an attached tyrosyl moiety. The photoexcited ruthenium complex playedthe role of P680and was first oxidized by external acceptors. Combined transient absorbance and EPR studies provided evidence that the Ru(III) formed was reduced by intramolecular electron transfer from the attached tyrosine, with a rate constant of 5104s-1. Thus we show that a tyrosine radical could be formed by light-induced electrontransfer reactions, and we indicate future directions for developing a closer analogy with the photosystem II reactions.
Place, publisher, year, edition, pages
1997. Vol. 119, no 44, 10720-10725 p.
Photosynthetic oxygen evolution, Y-Z, manganese cluster, excited-states, model, metal
IdentifiersURN: urn:nbn:se:uu:diva-72301DOI: 10.1021/ja972161hISI: A1997YE66100018OAI: oai:DiVA.org:uu-72301DiVA: diva2:100212
Addresses: UNIV UPPSALA, INST PHYS CHEM, S-75121 UPPSALA, SWEDEN. LUND UNIV, CTR CHEM & CHEM ENGN, DEPT BIOCHEM, S-22100 LUND, SWEDEN. ROYAL INST TECHNOL KTH, DEPT ORGAN CHEM, S-10044 STOCKHOLM, SWEDEN.2006-12-182006-12-182011-11-10Bibliographically approved