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Towards an artifici...
Towards an artificial model for Photosystem II : a manganese(II,II) dimer covalently linked to ruthenium(II) tris-bipyridine via a tyrosine derivative
- Article/chapterEnglish2000
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LIBRIS-ID:oai:DiVA.org:kth-19600
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-19600URI
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https://doi.org/10.1016/S0162-0134(99)00200-7DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-89494URI
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https://lup.lub.lu.se/record/125185URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20100525
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In order to model the individual electron transfer steps from the manganese cluster to the photooxidized sensitizer P-680(+) in Photosystem II (PS II) in green plants, the supramolecular complex 4 has been synthesized. In this complex, a ruthenium(II) tris-bipyridine type photosensitizer has been linked to a manganese(II) dimer via a substituted L-tyrosine, which bridges the manganese ions. The trinuclear complex 4 was characterized by electron paramagnetic resonance (EPR) and electrospray ionization mass spectrometry (ESI-MS). The excited state lifetime of the ruthenium tris-bipyridine moiety in 4 was found to be about 110 ns in acetonitrile, Using flash photolysis in the presence of an electron acceptor (methylviologen), it was demonstrated that in the supramolecular complex 4 an electron was transferred from the excited state of the ruthenium tris-bipyridine moiety to methylviologen, forming a methylviologen radical and a ruthenium(III) tris-bipyridine moiety. Next, the Ru(III) species retrieved the electron from the manganese(II/II) dimer in an intramolecular electron transfer reaction with a rate constant k(ET)>1.0X10(7) s(-1), generating a manganese(II/III) oxidation state and regenerating the ruthenium(II) photosensitizer. This is the first example of intramolecular electron transfer in a supramolecular complex, in which a manganese dimer is covalently linked to a photosensitizer via a tyrosine unit, in a process which mimics the electron transfer on the donor side of PS II.
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Raymond, M. K.Uppsala universitet,Fysikalisk-kemiska institutionen
(author)
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Magnuson, AnnLund University,Lunds universitet,Biokemi och Strukturbiologi,Centrum för Molekylär Proteinvetenskap,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Biochemistry and Structural Biology,Center for Molecular Protein Science,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)biok-ama
(author)
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LeGourrierec, D.Uppsala universitet,Fysikalisk-kemiska institutionen
(author)
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Tamm, M.
(author)
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Abrahamsson, M.Uppsala universitet,Fysikalisk-kemiska institutionen
(author)
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Huang, PingLund University,Lunds universitet,Biokemi och Strukturbiologi,Centrum för Molekylär Proteinvetenskap,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Biochemistry and Structural Biology,Center for Molecular Protein Science,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)biok-phu
(author)
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Martensson, J.
(author)
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Stenhagen, G.
(author)
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Hammarström, LeifUppsala universitet,Fysikalisk-kemiska institutionen(Swepub:uu)leifhamm
(author)
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Styring, StenbjörnLund University,Lunds universitet,Uppsala universitet,Molekylär biomimetik,Biokemi och Strukturbiologi,Centrum för Molekylär Proteinvetenskap,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Biochemistry and Structural Biology,Center for Molecular Protein Science,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)biok-sst
(author)
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Akermark, B.
(author)
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Uppsala universitetFysikalisk-kemiska institutionen
(creator_code:org_t)
Related titles
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In:Journal of Inorganic Biochemistry78:1, s. 15-220162-01341873-3344
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Sun, Licheng C.
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Raymond, M. K.
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Magnuson, Ann
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LeGourrierec, D.
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Tamm, M.
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Abrahamsson, M.
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Huang, Ping
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Martensson, J.
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Stenhagen, G.
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Hammarström, Lei ...
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Styring, Stenbjö ...
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Akermark, B.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
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and Biochemistry and ...
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Journal of Inorg ...
- By the university
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Royal Institute of Technology
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Uppsala University
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Lund University