title: Photocatalytic Oxygenation of Sulfide and Alkenes by Trinuclear Ruthenium Clusters.
abstract: Trinuclear Ru cluster photocatalysts that contain two Ru(II) photosensitizers and a Ru(II) reaction center are prepared, and their activity in the photocatalytic oxygenation of a sufide and alkenes is investigated. Photoirradiation (visible light) and the use of a Co salt ([Co(NH3)5Cl]Cl2, as an electron acceptor) are found to be essential for these catalytic reactions. The O atom of the water solvent (pH 6.8) is transferred to the substrate by a stepwise electron transfer and deprotonation of an aqua ligand at the reaction center. Through these processes, the aqua ligand coordinated at the reaction center is converted to a Ru(V)═O species, which is the active intermediate in the sulfide and alkene oxygenation.
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University , Minami-Osawa 1-1, Hachioji, Tokyo 192-0397, Japan.
authors.forename: Siwas
authors.initials: S
authors.lastname: Phungsripheng
authors.affiliation: Chemical Resources Laboratory, Tokyo Institute of Technology , R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Kozawa
authors.affiliation: Chemical Resources Laboratory, Tokyo Institute of Technology , R1-27, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
authors.forename: Munetaka
authors.initials: M
authors.lastname: Akita
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University , Minami-Osawa 1-1, Hachioji, Tokyo 192-0397, Japan.
authors.forename: Akiko
authors.initials: A
authors.lastname: Inagaki