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• W1999580902 abstract "Two series of Ru(II) polypyridyl compounds with formulas [(bpy)2RuL](PF6)2 and [(deeb)2RuL](PF6)2, where bpy is 2,2'-bipyridine, deeb is 4,4'-diethylester-2,2'-bpy, and L is one of several substituted 9'-(1,3-dithiole-2-ylidene)-4',5'-diazafluorene ligands, were studied as potential photosensitizers for TiO2. These compounds possess notably high extinction coefficients (≥40,000 M(-1) cm(-1) @470 nm) which are shown by time-dependent density functional theory (TD-DFT) calculations to result from overlapping metal-to-ligand charge transfer (MLCT) and ligand-localized transitions. Low-temperature absorption and photoluminescence measurements were suggestive of a short-lived MLCT excited state. When adsorbed onto TiO2 thin films, both the free ligands (L) and their corresponding [(deeb)2RuL](2+) complexes exhibited rapid excited-state electron injection into TiO2; in the case of the complexes, this was followed by rapid (k>10(8) s(-1)) hole transfer from Ru(III) to the 1,3-dithiole ring of the L ligand. Observation of diffusion-limited reductive quenching of the [Ru(bpz)3](2+)* (bpz is 2,2'-bipyrazine) excited state by the L ligands in solution supported the occurrence of intramolecular hole transfer following electron injection by the TiO2-anchored complexes." @default.
• W1999580902 created "2016-06-24" @default.
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• W1999580902 date "2014-03-19" @default.
• W1999580902 modified "2023-09-26" @default.
• W1999580902 title "High Extinction Coefficient Ru-Sensitizers that Promote Hole Transfer on Nanocrystalline TiO₂" @default.
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• W1999580902 doi "https://doi.org/10.1002/cphc.201301193" @default.
• W1999580902 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24648282" @default.
• W1999580902 hasPublicationYear "2014" @default.
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