title: A visible-light harvesting system for CO2 reduction using a Ru(II) -Re(I) photocatalyst adsorbed in mesoporous organosilica.
abstract: A photocatalytic system for CO2 reduction exhibiting visible-light harvesting was developed by preparing a hybrid consisting of a supramolecular metal complex as photocatalyst and periodic mesoporous organosilica (PMO) as light harvester. A Ru(II) Re(I) binuclear complex (RuRe) with methylphosphonic acid anchor groups was adsorbed on acridone or methylacridone embedded in the walls of PMO mesochannels to yield the hybrid structure. The embedded organic groups absorbed visible light, and the excitation energy was funneled to the Ru units. The energy accumulation was followed by electron transfer and catalytic reduction of CO2 to CO on the Re unit. The light harvesting of these hybrids enhanced the photocatalytic CO evolution rate by a factor of up to ten compared with that of RuRe adsorbed on mesoporous silica without a light harvester.
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-NE-1 O-okayama, Meguro-ku, Tokyo 152-8550 (Japan).
authors.forename: Yutaro
authors.initials: Y
authors.lastname: Ueda
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Takeda
authors.forename: Tatsuto
authors.initials: T
authors.lastname: Yui
authors.forename: Kazuhide
authors.initials: K
authors.lastname: Koike
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Goto
authors.forename: Shinji
authors.initials: S
authors.lastname: Inagaki
authors.forename: Osamu
authors.initials: O
authors.lastname: Ishitani
mesh_terms: D000166:Acridines / Q000737:chemistry; D054831:Acridones; D000327:Adsorption; D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D008027:Light; D008958:Models, Molecular; D008968:Molecular Conformation; D017646:Organosilicon Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D016062:Porosity; D012211:Rhenium / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*
chemical_list: D000166:Acridines; D054831:Acridones; D017646:Organosilicon Compounds; D002245:Carbon Dioxide; C041300:acridone; D012211:Rhenium; D012428:Ruthenium
keywords: artificial photosynthesis; co2 reduction; light harvesting; mesoporous materials; photochemistry