title: Dyads containing iridium(III) bis-terpyridine as photoactive center: synthesis and electron transfer study.
abstract: A series of Ir(III)-D dyads based on an iridium(III) bis-terpyridine complex as a photoactive center and tertiary amines as donor groups, as well as their individual components, have been designed to generate photoinduced charge separation. Depending on the donor group, a modular approach or a "chemistry-on-the-complex" approach has been used to prepare three different Ir(III)-D dyads. A detailed photophysical study has been performed on one Ir(III)-D dyad in which a triarylamine is linked to the iridium bis-terpyridine complex with an amido-phenyl group used as a spacer. In acetonitrile at room temperature, steady-state and time-resolved methods gave evidence of a photoinduced charge-separated state Ir(-)-D(+) with a lifetime of 70 ps. This relatively short lifetime could be due to the close proximity between the negative charge, likely localized in the bridging terpyridine, and the oxidized donor group.
authors.affiliation: Laboratoire de Chimie Organo-Minérale, UMR 7513 CNRS, Université Louis Pasteur, Institut Le Bel, 4, rue Blaise Pascal, 67070 Strasbourg, France.
authors.forename: Etienne
authors.initials: E
authors.lastname: Baranoff
authors.forename: Isabelle M
authors.initials: IM
authors.lastname: Dixon
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Collin
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Sauvage
authors.forename: Barbara
authors.initials: B
authors.lastname: Ventura
authors.forename: Lucia
authors.initials: L
authors.lastname: Flamigni