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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ruthenium(iii)-bis(phenolato)bipyridine/TiO2 hybrids: unprecedented photocatalytic hydrogen evolution
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Ruthenium(iii)-bis(phenolato)bipyridine/TiO2 hybrids: unprecedented photocatalytic hydrogen evolution

机译：钌（III）-BIS（苯酚）Biphyridine / TiO2杂种：前所未有的光催化氢进化

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摘要

In this work, two new bis-(hydroxyphenyl)bipyridine based ruthenium complexes with 4-picoline (coded as MCS-B4M) and isonicotinic acid (coded as MCS-B5M), which act as ancillary ligands, have been synthesized and employed for the first time as photosensitizers in photocatalytic hydrogen evolution studies. The photocatalyst MCS-B5M/TiO2-Pt showed an impressive hydrogen generation rate of up to 4.2 mmol h(-1) and turnover number (TON) of 84959 after 5 h. The better performance of B5TP over B4TP was due to the higher excited state lifetime of MCS-B5M (similar to 2.6 ns) than that of MCS-B4M (similar to 1.4 ns). This leads to a higher probability of electron transfer to the TiO2/Pt composite in the case of the former and a stronger coupling of MCS-B5M excited states with the conduction band of the TiO2/Pt composite by the -COOH linkers of the isonicotinic acid moiety, resulting in better photosensitization as observed in the UV-Vis (DRS mode) absorbance study. The comparative study of the two dyes clearly shows the manifestations of their respective ancillary ligands having contrasting electronic properties. This work gives a new class of ruthenium photosensitizers as efficient light harvesting photocatalysts.
机译：在这项工作中，两个新的双（羟基苯基）联吡啶钌配合物用4-甲基吡啶（编码为MCS-B4M）和异烟酸（编码为MCS-B5M），它作为辅助配体，已被合成并用于该首次作为光催化氢进化研究中的光敏剂。光催化剂MCS-B5M / TiO2-PT显示出令人印象深刻的氢气产生率，高达4.2mmol H（-1）和84959℃的周转数（吨）。 B5TP OVER B4TP的更好性能是由于MCS-B5M的兴奋状态较高（类似于2.6ns）（类似于1.4 ns）。这导致电子转移到TiO2 / Pt复合材料的概率在前者和MCS-B5M激发态的较强耦合与ISonicotinic酸的-COOH接头的-COOH接头的情况下与TiO2 / Pt复合物的导通带进行了更强的MCS-B5M激发态部分，导致在UV-Vis（DRS模式）吸光度研究中观察到的更好的光敏。两种染料的对比研究清楚地表明其各自的辅助配体具有对比的电子性质的表现形式。这项工作给出了一类新的钌光敏剂，作为有效的光催化剂。

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