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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
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Sun, Licheng C. (author)
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- Raymond, M. K. (author)
- Uppsala universitet,Fysikalisk-kemiska institutionen
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- Magnuson, Ann (author)
- Lund 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
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- LeGourrierec, D. (author)
- Uppsala universitet,Fysikalisk-kemiska institutionen
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Tamm, M. (author)
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- Abrahamsson, M. (author)
- Uppsala universitet,Fysikalisk-kemiska institutionen
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- Huang, Ping (author)
- Lund 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
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Martensson, J. (author)
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Stenhagen, G. (author)
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- Hammarström, Leif (author)
- Uppsala universitet,Fysikalisk-kemiska institutionen
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- Styring, Stenbjörn (author)
- Lund 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
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Akermark, B. (author)
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(creator_code:org_t)
- 2000
- 2000
- English.
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In: Journal of Inorganic Biochemistry. - 0162-0134 .- 1873-3344. ; 78:1, s. 15-22
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
Keyword
- ruthenium complexes
- manganese dimer complexes
- artificial photosynthesis
- electron transfer
- photosystem II
- electron-transfer
- mniimniii complexes
- photosynthesis
- proteins
- catalase
- spectra
- enzymes
- systems
- redox
- Electron transfer
- Artificial photosynthesis
- Manganese dimer complexes
- Ruthenium complexes
- Photosystem II
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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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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show more...
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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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show less...
- 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 ...
- Articles in the publication
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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