title: Synthesis and electron transfer studies of ruthenium-terpyridine-based dyads attached to nanostructured TiO2.
abstract: A series of bis(terpyridine)RuII complexes have been prepared, where one of the terpyridines is functionalized in the 4'-position by a phosphonic or carboxylic acid group for attachment to TiO2. The other is functionalized, also in the 4'-position, by a potential electron donor. In complexes 1a, 3a, and 4a,b, this donor is tyrosine or hydrogen-bonded tyrosine, while in 2a it is carotenoic amide. The synthesis and photophysical properties of the complexes are discussed. On irradiation with visible light, the formation of a long-lived charge-separated state was anticipated, via primary electron ejection into the TiO2, followed by secondary electron transfer from the donor to the photogenerated RuIII. However, such a charge-separated state could be observed with certainty only with complex 2a. To explain the result, quantum chemical calculations were performed on the different types of complexes.
authors.affiliation: Department of Organic Chemistry, Stockholm University, S-106 91 Stockholm, Sweden.
authors.forename: Henriette
authors.initials: H
authors.lastname: Wolpher
authors.forename: Subrata
authors.initials: S
authors.lastname: Sinha
authors.forename: Jingxi
authors.initials: J
authors.lastname: Pan
authors.forename: Anh
authors.initials: A
authors.lastname: Johansson
authors.forename: Maria J
authors.initials: MJ
authors.lastname: Lundqvist
authors.forename: Petter
authors.initials: P
authors.lastname: Persson
authors.forename: Reiner
authors.initials: R
authors.lastname: Lomoth
authors.forename: Jonas
authors.initials: J
authors.lastname: Bergquist
authors.forename: Licheng
authors.initials: L
authors.lastname: Sun
authors.forename: Villy
authors.initials: V
authors.lastname: Sundström
authors.forename: Björn
authors.initials: B
authors.lastname: Akermark
authors.forename: Tomas
authors.initials: T
authors.lastname: Polívka