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Light-Driven Tyrosine Radical Formation in a Ruthenium-Tyrosine Complex Attached to Nanoparticle TiO2

Ghanem, Raed LU ; Xu, Yunhua; Pan, Jie LU ; Hoffman, Tobias; Andersson, Johan LU ; Polivka, Tomas LU ; Pascher, Torbjörn LU ; Styring, Stenbjörn LU ; Sun, Licheng and Sundström, Villy LU (2002) In Inorganic Chemistry 41(24). p.6258-6266
Abstract
We demonstrate a possibility of multistep electron transfer in a supramolecular complex adsorbed on the surface of nanocrystalline TiO2. The complex mimics the function of the tyrosineZ and chlorophyll unit P680 in natural photosystem II (PSII). A ruthenium(II) tris(bipyridyl) complex covalently linked to a L-tyrosine ethyl ester through an amide bond was attached to the surface of nanocrystalline TiO2 via carboxylic acid groups linked to the bpy ligands. Synthesis and characterization of this complex are described. Excitation (450 nm) of the complex promotes an electron to a metal-to-ligand charge-transfer (MLCT) excited state, from which the electron is injected into TiO2. The photogeneration of Ru(III) is followed by an intramolecular... (More)
We demonstrate a possibility of multistep electron transfer in a supramolecular complex adsorbed on the surface of nanocrystalline TiO2. The complex mimics the function of the tyrosineZ and chlorophyll unit P680 in natural photosystem II (PSII). A ruthenium(II) tris(bipyridyl) complex covalently linked to a L-tyrosine ethyl ester through an amide bond was attached to the surface of nanocrystalline TiO2 via carboxylic acid groups linked to the bpy ligands. Synthesis and characterization of this complex are described. Excitation (450 nm) of the complex promotes an electron to a metal-to-ligand charge-transfer (MLCT) excited state, from which the electron is injected into TiO2. The photogeneration of Ru(III) is followed by an intramolecular electron transfer from tyrosine to Ru(III), regenerating the photosensitizer Ru(II) and forming the tyrosyl radical. The tyrosyl radical is formed in less than 5 s with a yield of 15%. This rather low yield is a result of a fast back electron transfer reaction from the nanocrystalline TiO2 to the photogenerated Ru(III). (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Inorganic Chemistry
volume
41
issue
24
pages
6258 - 6266
publisher
The American Chemical Society
external identifiers
  • pmid:12444768
  • wos:000179540200019
  • scopus:0037010955
ISSN
1520-510X
DOI
10.1021/ic020472+
language
English
LU publication?
yes
id
e6edabfb-c158-41de-89aa-a1fcccc33b5b (old id 124774)
date added to LUP
2007-07-04 17:06:49
date last changed
2017-07-23 03:39:25
@article{e6edabfb-c158-41de-89aa-a1fcccc33b5b,
  abstract     = {We demonstrate a possibility of multistep electron transfer in a supramolecular complex adsorbed on the surface of nanocrystalline TiO2. The complex mimics the function of the tyrosineZ and chlorophyll unit P680 in natural photosystem II (PSII). A ruthenium(II) tris(bipyridyl) complex covalently linked to a L-tyrosine ethyl ester through an amide bond was attached to the surface of nanocrystalline TiO2 via carboxylic acid groups linked to the bpy ligands. Synthesis and characterization of this complex are described. Excitation (450 nm) of the complex promotes an electron to a metal-to-ligand charge-transfer (MLCT) excited state, from which the electron is injected into TiO2. The photogeneration of Ru(III) is followed by an intramolecular electron transfer from tyrosine to Ru(III), regenerating the photosensitizer Ru(II) and forming the tyrosyl radical. The tyrosyl radical is formed in less than 5 s with a yield of 15%. This rather low yield is a result of a fast back electron transfer reaction from the nanocrystalline TiO2 to the photogenerated Ru(III).},
  author       = {Ghanem, Raed and Xu, Yunhua and Pan, Jie and Hoffman, Tobias and Andersson, Johan and Polivka, Tomas and Pascher, Torbjörn and Styring, Stenbjörn and Sun, Licheng and Sundström, Villy},
  issn         = {1520-510X},
  language     = {eng},
  number       = {24},
  pages        = {6258--6266},
  publisher    = {The American Chemical Society},
  series       = {Inorganic Chemistry},
  title        = {Light-Driven Tyrosine Radical Formation in a Ruthenium-Tyrosine Complex Attached to Nanoparticle TiO2},
  url          = {http://dx.doi.org/10.1021/ic020472+},
  volume       = {41},
  year         = {2002},
}