title: Synthesis and characterization of an immobilizable photochemical molecular device for H2-generation.
abstract: With [Ru(II)(bpyMeP)2tpphzPtCl2](2+) (4) a molecular photocatalyst has been synthesized for visible-light-driven H2-evolution. It contains the ligand bpyMeP (4,4'-bis(diethyl-(methylene)-phosphonate)-2,2'-bipyridine) with phosphate ester groups as precursors for the highly potent phosphonate anchoring groups, which can be utilized for immobilization of the catalyst on metal-oxide semiconductor surfaces. The synthesis was optimized with regard to high yields, bpyMeP was fully characterized and a solid-state structure could be obtained. Photophysical studies showed that the photophysical properties and the localization of the excited states are not altered compared to similar Ru-complexes without anchoring group precursors. (4) was even more active in homogenous catalysis experiments than [Ru(II)(tbbpy)2tpphzPtCl2](2+) (6) with tbbpy (4,4'-bis(tbutyl)-2,2'-bipyridine) as peripheral ligands. After hydrolysis (4) was successfully immobilized on NiO, suggesting that an application in photoelectrosynthesis cells is feasible.
authors.affiliation: Universität Ulm, Anorganische Chemie I, Albert-Einstein-Allee 11, D-89081 Ulm, Germany. Sven.Rau@uni-ulm.de.
authors.forename: Markus
authors.initials: M
authors.lastname: Braumüller
authors.forename: Martin
authors.initials: M
authors.lastname: Schulz
authors.forename: Dieter
authors.initials: D
authors.lastname: Sorsche
authors.forename: Michael
authors.initials: M
authors.lastname: Pfeffer
authors.forename: Markus
authors.initials: M
authors.lastname: Schaub
authors.forename: Jürgen
authors.initials: J
authors.lastname: Popp
authors.forename: Byung-Wook
authors.initials: BW
authors.lastname: Park
authors.forename: Anders
authors.initials: A
authors.lastname: Hagfeldt
authors.forename: Benjamin
authors.initials: B
authors.lastname: Dietzek
authors.forename: Sven
authors.initials: S
authors.lastname: Rau