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Photo-induced oxida...
Photo-induced oxidation of a dinuclear Mn-2(II,II) complex to the Mn-2(III,IV) state by inter- and intramolecular electron transfer to Ru-III tris-bipyridine
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- Huang, Ping (author)
- Uppsala universitet,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,Molekylär biomimetik
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- Magnuson, Ann (author)
- Uppsala universitet,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,Molekylär biomimetik
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- Lomoth, R. (author)
- Uppsala universitet,Fysikalisk kemi
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Abrahamsson, M. (author)
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Tamm, M. (author)
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Sun, Licheng (author)
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van Rotterdam, B. (author)
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- Park, Jonathan (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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- Hammarstrom, L. (author)
- Uppsala universitet,Fysikalisk kemi
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Akermark, B. (author)
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- Styring, Stenbjörn (author)
- Uppsala universitet,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,Molekylär biomimetik
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(creator_code:org_t)
- 2002
- 2002
- English.
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In: Journal of Inorganic Biochemistry. - 0162-0134 .- 1873-3344. ; 91:1, s. 159-172
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http://dx.doi.org/10...
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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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- To model the structural and functional parts of the water oxidizing complex in Photosystem 11, a dimeric manganese(II,11) complex (1) was linked to a ruthenium(II)tris-bipyridine (Ru-II(bpy)3) complex via a substituted L-tyrosine, to form the trinuclear complex 2 [J. Inorg. Biochem. 78 (2000) 15]. Flash photolysis of 1 and Ru-II(bpy), in aqueous solution, in the presence of an electron acceptor, resulted in the stepwise extraction of three electrons by Ru-III(bpy), from the Mn-2(II,II) dimer, which then attained the Mn-2(III,IV) oxidation state. In a similar experiment with compound 2, the dinuclear Mn complex reduced the photo-oxidized Ru moiety via intramolecular electron transfer on each photochemical event. From EPR it was seen that 2 also reached the Mn-2(III,IV) state. Our data indicate that oxidation from the Mn-2(II,II) state proceeds stepwise via intermediate formation of Mn-2(II,III) and Mn-2(III,III). In the presence of water, cyclic voltammetry showed an additional anodic peak beyond Mn-2(II,III/III,III) oxidation which was significantly lower than in neat acetonitrile. Assuming that this peak is due to oxidation to Mn-2(III,IV), this suggests that water is essential for the formation of the Mn-2(III,IV) oxidation state. Compound 2 is a structural mimic of the water oxidizing complex, in that it links a Mn complex via a tyrosine to a highly oxidizing photosensitizer. Complex 2 also mimics mechanistic aspects of Photosystem 11, in that the electron transfer to the photosensitizer is fast and results in several electron extractions from the Mn moiety.
Subject headings
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- manganese
- EPR spectroscopy
- electrochemistry
- artificial photosynthesis
- bioinorganic chemistry
- valence mniimniii complexes
- photosystem-ii
- manganese complexes
- different solvents
- water oxidation
- catalase
- tyrosine
- models
- epr
- ruthenium
- Bioinorganic chemistry
- Artificial photosynthesis
- Electrochemistry
- Manganese
- EPR spectroscopy
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
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Huang, Ping
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Magnuson, Ann
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Lomoth, R.
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Abrahamsson, M.
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Tamm, M.
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Sun, Licheng
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show more...
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van Rotterdam, B ...
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Park, Jonathan
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Hammarstrom, L.
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Akermark, B.
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Styring, Stenbjö ...
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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 ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
- 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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Lund University
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Uppsala University