title: Photocatalyzed sulfide oxygenation with water as the unique oxygen atom source.
abstract: In our research program aiming to develop new ruthenium-based polypyridine catalysts for oxidation we were interested in combining a photosensitizer and a catalytic fragment within the same complex to achieve catalytic light-driven oxidation. To respond to the lack of such conjugates, we report here a new catalytic system capable of using light to activate water molecules in order to perform selective sulfide oxygenation into sulfoxide via an oxygen atom transfer from H(2)O to the substrate with a TON of up to 197 ± 6. On the basis of electrochemical and photophysical studies, a proton-coupled electron-transfer process yielding to an oxidant Ru(IV)-oxo species was proposed. In particular, the synergistic effect between both partners in the dyad yielding  a more efficient catalyst compared to the bimolecular system is highlighted.
authors.affiliation: Laboratoire de Chimie et Biologie des Métaux, UMR 5249-Université Grenoble I-CNRS-CEA CEA Grenoble, 17 Avenue des Martyrs, 38054 Grenoble, France.
authors.forename: Pascal
authors.initials: P
authors.lastname: Guillo
authors.forename: Olivier
authors.initials: O
authors.lastname: Hamelin
authors.forename: Pinar
authors.initials: P
authors.lastname: Batat
authors.forename: Gediminas
authors.initials: G
authors.lastname: Jonusauskas
authors.forename: Nathan D
authors.initials: ND
authors.lastname: McClenaghan
authors.forename: Stéphane
authors.initials: S
authors.lastname: Ménage