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- W2327350514 abstract "The synthesis, characterization, and redox properties are described for a new ruthenium-based chromophore–catalyst assembly, [(bpy)2Ru(4-Mebpy-4′-bimpy)Ru(tpy)(OH2)]4+ (1, [RuaII-RubII-OH2]4+; bpy = 2,2′-bipyridine; 4-Mebpy-4′-bimpy = 4-(methylbipyridin-4′-yl)-N-benzimid-N′-pyridine; tpy = 2,2′:6′,2″-terpyridine), as its chloride salt. The assembly incorporates both a visible light absorber and a catalyst for water oxidation. With added ceric ammonium nitrate (CeIV, or CAN), both 1 and 2, [Ru(tpy)(Mebim-py)(OH2)]2+ (Mebim-py = 2-pyridyl-N-methylbenzimidazole), catalyze water oxidation. Time-dependent UV/vis spectral monitoring following addition of 30 equiv of CeIV reveals that the rate of CeIV consumption is first order both in CeIV and in an oxidized form of the assembly. The rate-limiting step appears to arise from slow oxidation of this intermediate followed by rapid release of O2. This is similar to isolated catalyst 2, with redox potentials comparable to the [-Rub-OH2]2+ site in 1, but 1 is more reactive than 2 by a factor of 8 due to a redox mediator effect." @default.
- W2327350514 created "2016-06-24" @default.
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- W2327350514 date "2013-02-01" @default.
- W2327350514 modified "2023-10-16" @default.
- W2327350514 title "Redox Mediator Effect on Water Oxidation in a Ruthenium-Based Chromophore–Catalyst Assembly" @default.
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- W2327350514 doi "https://doi.org/10.1021/ja311645d" @default.
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