title: Visible light induced catalytic water reduction without an electron relay.
abstract: Protons from water are reduced by a catalytic system composed of a heteroleptic iridium(III) photosensitizer [Ir(ppy)2(bpy)]+, platinum catalyst, and sacrificial reductant. The hydrogen quantum yield reaches 0.26 in this study, which proceeds via reductive quenching of the excited photosensitizer by triethanolamine. This simplified approach allows the characterization of degradation products that are otherwise obscured in more complex systems. A novel 16-well setup for parallel kinetic analysis of H2 evolution enables high-throughput screening of reaction conditions and quantization of the decaying reaction rate. DFT calculations rationalize the differences between this and previous studies on tris-diimine ruthenium(II) photosensitizers.
authors.affiliation: Department of Chemistry, Princeton University, Princeton NJ 08544, USA.
authors.forename: Leonard L
authors.initials: LL
authors.lastname: Tinker
authors.forename: Neal D
authors.initials: ND
authors.lastname: McDaniel
authors.forename: Peter N
authors.initials: PN
authors.lastname: Curtin
authors.forename: Courtney K
authors.initials: CK
authors.lastname: Smith
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Ireland
authors.forename: Stefan
authors.initials: S
authors.lastname: Bernhard
mesh_terms: D002384:Catalysis / Q000528:radiation effects; D006859:Hydrogen / Q000737:chemistry / Q000528:radiation effects; D007495:Iridium / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry* / Q000528:radiation effects; D010084:Oxidation-Reduction / Q000528:radiation effects; D010777:Photochemistry; D010984:Platinum / Q000737:chemistry* / Q000528:radiation effects; D011789:Quantum Theory; D013997:Time Factors; D014867:Water / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D014867:Water; D007495:Iridium; D010984:Platinum; D006859:Hydrogen