Mimicking electron transfer reactions in photosystem II: Synthesis and photochemical characterization of a ruthenium(II) tris(bipyridyl) complex with a covalently linked tyrosine
(1997) In Journal of the American Chemical Society 119(44). p.10720-10725- Abstract
- In the natural photosynthetic reaction center photosystem II, absorption of a photon leads to photooxidation of the primary electron donor P-680, which subsequently retrieves electrons from a tyrosyl residue, functioning as an interface to the oxygen-evolving manganese complex. In a first step toward mimicking these reactions, we have made a Ru(II)-polypyridine complex with an attached tyrosyl moiety. The photoexcited ruthenium complex played the role of P-680 and was first oxidized by external accepters. 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 5 x 10(4) s(-1). Thus we show that a tyrosine... (More)
- In the natural photosynthetic reaction center photosystem II, absorption of a photon leads to photooxidation of the primary electron donor P-680, which subsequently retrieves electrons from a tyrosyl residue, functioning as an interface to the oxygen-evolving manganese complex. In a first step toward mimicking these reactions, we have made a Ru(II)-polypyridine complex with an attached tyrosyl moiety. The photoexcited ruthenium complex played the role of P-680 and was first oxidized by external accepters. 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 5 x 10(4) s(-1). Thus we show that a tyrosine radical could be formed by light-induced electron transfer reactions, and we indicate future directions for developing a closer analogy with the photosystem II reactions. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/127082
- author
- Magnuson, Ann LU ; Berglund, H ; Korall, P ; Hammarstrom, L ; Akermark, B ; Styring, Stenbjörn LU and Sun, LC
- organization
- publishing date
- 1997
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- PHOTOSYNTHETIC OXYGEN EVOLUTION, Y-Z, MANGANESE CLUSTER, EXCITED-STATES, MODEL, METAL
- in
- Journal of the American Chemical Society
- volume
- 119
- issue
- 44
- pages
- 10720 - 10725
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:0030784901
- ISSN
- 1520-5126
- DOI
- 10.1021/ja972161h
- language
- English
- LU publication?
- yes
- id
- 8dae25b6-af44-46b9-9e8b-fb160b203a7e (old id 127082)
- date added to LUP
- 2016-04-01 17:14:39
- date last changed
- 2022-01-29 01:22:34
@article{8dae25b6-af44-46b9-9e8b-fb160b203a7e, abstract = {{In the natural photosynthetic reaction center photosystem II, absorption of a photon leads to photooxidation of the primary electron donor P-680, which subsequently retrieves electrons from a tyrosyl residue, functioning as an interface to the oxygen-evolving manganese complex. In a first step toward mimicking these reactions, we have made a Ru(II)-polypyridine complex with an attached tyrosyl moiety. The photoexcited ruthenium complex played the role of P-680 and was first oxidized by external accepters. 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 5 x 10(4) s(-1). Thus we show that a tyrosine radical could be formed by light-induced electron transfer reactions, and we indicate future directions for developing a closer analogy with the photosystem II reactions.}}, author = {{Magnuson, Ann and Berglund, H and Korall, P and Hammarstrom, L and Akermark, B and Styring, Stenbjörn and Sun, LC}}, issn = {{1520-5126}}, keywords = {{PHOTOSYNTHETIC OXYGEN EVOLUTION; Y-Z; MANGANESE CLUSTER; EXCITED-STATES; MODEL; METAL}}, language = {{eng}}, number = {{44}}, pages = {{10720--10725}}, publisher = {{The American Chemical Society (ACS)}}, series = {{Journal of the American Chemical Society}}, title = {{Mimicking electron transfer reactions in photosystem II: Synthesis and photochemical characterization of a ruthenium(II) tris(bipyridyl) complex with a covalently linked tyrosine}}, url = {{http://dx.doi.org/10.1021/ja972161h}}, doi = {{10.1021/ja972161h}}, volume = {{119}}, year = {{1997}}, }