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

Research output: Contribution to journalArticle

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.

Details

Authors
  • Jingxi Pan
  • Yunhua Xu
  • Gabor Benko
  • Yashar Feyziyev
  • Stenbjörn Styring
  • Licheng Sun
  • Björn Åkermark
  • Tomas Polivka
  • Villy Sundström
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
  • Biological Sciences
Original languageEnglish
Pages (from-to)12904-12910
JournalThe Journal of Physical Chemistry Part B
Volume108
Issue number34
Publication statusPublished - 2004
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060), Biochemistry and Structural Biology (S) (000006142), Department of Chemistry (011001220)