title: Development of highly efficient supramolecular CO2 reduction photocatalysts with high turnover frequency and durability.
abstract: New Ru(II)-Re(I) supramolecular photocatalysts with a rhenium(I) biscarbonyl complex as a catalyst unit were synthesized. They photocatalyzed CO2 reduction to CO using a wide-range of visible light, and their photocatalytic abilities were strongly affected by the phosphorus ligands on the Re site. Especially, Ru-Re(FPh), with two P(p-FPh)3 ligands, exhibited tremendous photocatalytic properties, i.e. TN(CO) = 207 and phi(CO) = 0.15, and, in addition, this is one of the fastest-operating photocatalysts for CO2 reduction to CO, with TF(CO) = 281 h(-1). We also clarified a balance of transferred electrons in this photocatalytic reaction and found that the two electrons necessary for CO formation were provided by two sequential reductive quenching processes of the excited Ru photosensitizer unit by the reductant BNAH.
authors.affiliation: Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama 2-12-1-E1-9, Meguro-ku, Tokyo, 152-8551, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Tamaki
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Watanabe
authors.forename: Kazuhide
authors.initials: K
authors.lastname: Koike
authors.forename: Haruo
authors.initials: H
authors.lastname: Inoue
authors.forename: Tatsuki
authors.initials: T
authors.lastname: Morimoto
authors.forename: Osamu
authors.initials: O
authors.lastname: Ishitani