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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Onium Salt Effects on p-Terphenyl-Sensitized Photoreduction of Water to Hydrogen
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Onium Salt Effects on p-Terphenyl-Sensitized Photoreduction of Water to Hydrogen

机译:鎓盐对对三联苯的光致氢光还原反应的影响

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摘要

p-Terphenyl (TP) sensitizes photocatalytic reduction of water to H_2 under UV irradiation of homogeneous aqueous acetonitrile solution in the presence of triethylamine (TEA) as an electron donor and Ru~(3+) as a precursor of cocatalyst, Ru metal colloid. The addition of quaternary onium salts enhances the H_2 evolution, where the onium salts with longer alkyl groups become more effective. Dynamics studies of TP photosensitization reveal that the presence of the salts contributes to stabilization of the radical anion of TP (TP~(centre dot -)) formed through reductive quenching of the singlet state of TP (~1TP~*) and the triplet state of TP (~3TP~*) by TEA. The TP photosensitization accompanies competitive photo-Birch reduction via TP~-. but the presence of onium salts enhances the lifetime of TP~(centre dot -) through the specific interaction, leading to the effective TP photosensitized H_2 evolution.
机译:对三联苯(TP)在三乙胺(TEA)作为电子供体和Ru〜(3+)作为助催化剂Ru金属胶体的前体存在下,在均相乙腈水溶液的UV辐射下,将水光催化还原为H_2,将水光催化还原为H_2。季鎓盐的添加增强了H_2的释放,其中具有更长烷基的鎓盐变得更有效。 TP光敏化的动力学研究表明,盐的存在有助于通过还原猝灭TP的单重态(〜1TP〜*)和三重态而形成的TP自由基阴离子(TP〜(中心点-))的稳定化。 TEA的TP(〜3TP〜*)。 TP光敏化通过TP〜-伴随竞争性的光桦减少。但是鎓盐的存在通过特异性相互作用延长了TP〜(中心点-)的寿命,从而导致TP有效地光敏化了H_2。

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