1380114-95-3Relevant articles and documents
Photoinduced electron transfer in a chromophore-catalyst assembly anchored to TiO2
Ashford, Dennis L.,Song, Wenjing,Concepcion, Javier J.,Glasson, Christopher R. K.,Brennaman, M. Kyle,Norris, Michael R.,Fang, Zhen,Templeton, Joseph L.,Meyer, Thomas J.
, p. 19189 - 19198 (2012)
Photoinduced formation, separation, and buildup of multiple redox equivalents are an integral part of cycles for producing solar fuels in dye-sensitized photoelectrosynthesis cells (DSPECs). Excitation wavelength-dependent electron injection, intra-assembly electron transfer, and pH-dependent back electron transfer on TiO2 were investigated for the molecular assembly [((PO3H2-CH2)-bpy) 2Rua(bpy-NH-CO-trpy)Rub(bpy)(OH 2)]4+ ([TiO2-RuaII- RubII-OH2]4+; ((PO3H 2-CH2)2-bpy = ([2,2′-bipyridine]-4, 4′-diylbis(methylene))diphosphonic acid); bpy-ph-NH-CO-trpy = 4-([2,2′:6′,2″-terpyridin]-4′-yl)-N-((4′-methyl- [2,2′-bipyridin]-4-yl)methyl) benzamide); bpy = 2,2′-bipyridine). This assembly combines a light-harvesting chromophore and a water oxidation catalyst linked by a synthetically flexible saturated bridge designed to enable long-lived charge-separated states. Following excitation of the chromophore, rapid electron injection into TiO2 and intra-assembly electron transfer occur on the subnanosecond time scale followed by microsecond- millisecond back electron transfer from the semiconductor to the oxidized catalyst, [TiO2(e-)-RuaII-Ru bIII-OH2]4+→[TiO 2-RuaII-RubII-OH 2]4+.
