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Stepwise charge separation from a ruthenium-tyrosine complex to a nanocrystalline TiO2 film

Pan, Jingxi LU ; Xu, Yunhua; Benko, Gabor LU ; Feyziyev, Yashar LU ; Styring, Stenbjörn LU ; Sun, Licheng; Åkermark, Björn; Polivka, Tomas LU and Sundström, Villy LU (2004) In The Journal of Physical Chemistry Part B 108(34). p.12904-12910
Abstract
A supramolecular complex composed of Ru(II) tris-bipyridine, tyrosine, and dipicolylamine was synthesized and characterized. This complex was attached to TiO2 nanocrystalline films via ester groups at the Ru(II) chromophore, and photoinduced multistep electron transfer was investigated by laser flash photolysis and electron paramagnetic resonance techniques. Following ultrafast electron injection from the metal-ligand charge transfer excited states of Ru(II) to the conduction band of TiO2, fast intramolecular electron transfer from the tyrosine moiety to the photogenerated Ru(III) was observed, characterized by a rate constant of similar to2 x 10(6) s(-1). By comparison of recovery kinetics at the isosbestic point with that of the... (More)
A supramolecular complex composed of Ru(II) tris-bipyridine, tyrosine, and dipicolylamine was synthesized and characterized. This complex was attached to TiO2 nanocrystalline films via ester groups at the Ru(II) chromophore, and photoinduced multistep electron transfer was investigated by laser flash photolysis and electron paramagnetic resonance techniques. Following ultrafast electron injection from the metal-ligand charge transfer excited states of Ru(II) to the conduction band of TiO2, fast intramolecular electron transfer from the tyrosine moiety to the photogenerated Ru(III) was observed, characterized by a rate constant of similar to2 x 10(6) s(-1). By comparison of recovery kinetics at the isosbestic point with that of the reference compound lacking the tyrosine, it was found that the intramolecular electron-transfer efficiency is 90%. A hydrogen-bond-promoted electron-transfer mechanism is proposed. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
108
issue
34
pages
12904 - 12910
publisher
The American Chemical Society
external identifiers
  • wos:000223430800042
  • scopus:4444288830
ISSN
1520-5207
DOI
10.1021/jp049449v
language
English
LU publication?
yes
id
21fb4bf1-4044-4503-abcc-306f2df74b96 (old id 138715)
date added to LUP
2007-07-03 14:36:18
date last changed
2017-07-23 04:35:05
@article{21fb4bf1-4044-4503-abcc-306f2df74b96,
  abstract     = {A supramolecular complex composed of Ru(II) tris-bipyridine, tyrosine, and dipicolylamine was synthesized and characterized. This complex was attached to TiO2 nanocrystalline films via ester groups at the Ru(II) chromophore, and photoinduced multistep electron transfer was investigated by laser flash photolysis and electron paramagnetic resonance techniques. Following ultrafast electron injection from the metal-ligand charge transfer excited states of Ru(II) to the conduction band of TiO2, fast intramolecular electron transfer from the tyrosine moiety to the photogenerated Ru(III) was observed, characterized by a rate constant of similar to2 x 10(6) s(-1). By comparison of recovery kinetics at the isosbestic point with that of the reference compound lacking the tyrosine, it was found that the intramolecular electron-transfer efficiency is 90%. A hydrogen-bond-promoted electron-transfer mechanism is proposed.},
  author       = {Pan, Jingxi and Xu, Yunhua and Benko, Gabor and Feyziyev, Yashar and Styring, Stenbjörn and Sun, Licheng and Åkermark, Björn and Polivka, Tomas and Sundström, Villy},
  issn         = {1520-5207},
  language     = {eng},
  number       = {34},
  pages        = {12904--12910},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Stepwise charge separation from a ruthenium-tyrosine complex to a nanocrystalline TiO2 film},
  url          = {http://dx.doi.org/10.1021/jp049449v},
  volume       = {108},
  year         = {2004},
}