title: Light Energy Accumulation from Pyrene Derivative to Tris(bipyridine)ruthenium on Clay Surface.
abstract: A novel type of energy donor-acceptor system on a clay surface has been prepared. The energy transfer between an energy-donating cationic pyrene derivative (An-Py2+) and an energy-accepting tris(bipyridine)ruthenium complex (Ru2+) on the clay surface was investigated using absorption, emission, and lifetime measurements. An obvious energy transfer was observed, and one Ru2+molecule quenched the emission from five molecules of An-Py2+with an emission quenching efficiency of 85% on the clay surface. This suggests that the light energies absorbed by five of the An-Py2+molecules were accumulated in the one Ru2+molecule. Near-quantitative emission quenching was observed for stoichiometric amounts of An-Py2+and Ru2+. The apparent quenching rate constant is approximately 1017L mol-1s-1, and thus the quenching rate constant is 107-108times higher than the diffusion rate constant in a homogeneous solution.
authors.affiliation: Department of Materials Science and Technology, Faculty of Engineering, Niigata University , 8050 Ikarashi-2, Niigata 950-2181, Japan.
authors.forename: Daiki
authors.initials: D
authors.lastname: Morimoto
authors.affiliation: Department of Materials Science and Technology, Faculty of Engineering, Niigata University , 8050 Ikarashi-2, Niigata 950-2181, Japan.
authors.forename: Haruya
authors.initials: H
authors.lastname: Yoshida
authors.affiliation: Department of Materials Science and Technology, Faculty of Engineering, Niigata University , 8050 Ikarashi-2, Niigata 950-2181, Japan.
authors.forename: Keita
authors.initials: K
authors.lastname: Sato
authors.affiliation: Department of Materials Science and Technology, Faculty of Engineering, Niigata University , 8050 Ikarashi-2, Niigata 950-2181, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Saito
authors.affiliation: Department of Materials Science and Technology, Faculty of Engineering, Niigata University , 8050 Ikarashi-2, Niigata 950-2181, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yagi
authors.affiliation: Department of Applied Chemistry, Graduate Course of Urban Environmental Sciences, Tokyo Metropolitan University , Minami-ohsawa 1-1, Hachiohji, Tokyo 192-0397, Japan.
authors.forename: Shinsuke
authors.identifier: 0000-0001-7013-4942
authors.initials: S
authors.lastname: Takagi
authors.affiliation: Department of Materials Science and Technology, Faculty of Engineering, Niigata University , 8050 Ikarashi-2, Niigata 950-2181, Japan.
authors.forename: Tatsuto
authors.identifier: 0000-0002-7526-3521
authors.initials: T
authors.lastname: Yui