Related Products of 1245-13-2, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1245-13-2, Name is [2,2′-Biquinoline]-4,4′-dicarboxylic acid, molecular formula is C20H12N2O4. In a Article，once mentioned of 1245-13-2
Nanocrystalline (anatase), mesoporous TiO2 thin films were functionalized with [Ru(bpy)2(deebq)]-(PF6)2, [Ru(bq)2(deeb)](PF6)2, [Ru(deebq) 2(bpy)](PF6)2, [Ru(bpy)(deebq)(NCS) 2], or [Os(bpy)2(deebq)](PF6)2, where bpy is 2,2?-bipyridine, bq is 2,2?-biquinoline, and deeb and deebq are 4,4?-diethylester derivatives. These compounds bind to the nanocrystalline TiO2 films in their carboxylate forms with limiting surface coverages of 8 (± 2) × 10-8 mol/cm2. Electrochemical measurements show that the first reduction of these compounds (-0.70 V vs SCE) occurs prior to TiO2 reduction. Steady state illumination in the presence of the sacrificial electron donor triethylamine leads to the appearance of the reduced sensitizer. The thermally equilibrated metal-to-ligand charge-transfer excited state and the reduced form of these compounds do not inject electrons into TiO2. Nanosecond transient absorption measurements demonstrate the formation of an extremely long-lived charge separated state based on equal concentrations of the reduced and oxidized compounds. The results are consistent with a mechanism of ultrafast excited-state injection into TiO2 followed by interfacial electron transfer to a ground-state compound. The quantum yield for this process was found to increase with excitation energy, a behavior attributed to stronger overlap between the excited sensitizer and the semiconductor acceptor states. For example, the quantum yields for [Os(bpy)2(dcbq)]/TiO2 were phi(417 nm) = 0.18 ± 0.02, phi(532.5 nm) = 0.08 ± 0.02, and phi(683 nm) = 0.05 ± 0.01. Electron transfer to yield ground-state products occurs by lateral intermolecular charge transfer. The driving force for charge recombination was in excess of that stored in the photoluminescent excited state. Chronoabsorption measurements indicate that ligand-based intermolecular electron transfer was an order of magnitude faster than metal-centered intermolecular hole transfer. Charge recombination was quantified with the Kohlrausch-Williams-Watts model.
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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI