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Tuning the Accessibility and Activity of Au-25(SR)(18) Nanocluster Catalysts through Ligand Engineering

机译:通过配体工程调节Au-25(SR)(18)纳米簇催化剂的可及性和活性

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摘要

In this work, the effects of thiolate ligands (-SR, e.g., chain length and functional moiety) on the accessibility and catalytic activity of thiolate-protected gold nanoclusters (e.g., Au-25(SR)(18)) for 4-nitrophenol hydrogenation is reported. The data suggest that Au-25(SR)(18) bearing a shorter alkyl chain shows a better accessibility to the substrates (shown by shorter induction time, t(0)) and a higher catalytic activity (shown by higher apparent reaction rate constant, k(app)). The functional moiety of the ligands is another determinant factor, which clearly suggests that ligand engineering of Au-25(SR)(18) would be an efficient platform for fine-tuning its catalytic properties.
机译:在这项工作中,硫醇盐配体(-SR,例如链长和功能部分)对硫醇盐保护的金纳米团簇(例如Au-25(SR)(18))对4-硝基苯酚的可及性和催化活性的影响据报道氢化。数据表明,带有较短烷基链的Au-25(SR)(18)显示出对底物的更好可达性(由较短的诱导时间t(0)表示)和较高的催化活性(由较高的表观反应速率常数表示) ,k(app))。配体的功能部分是另一个决定性因素,这清楚地表明Au-25(SR)(18)的配体工程将是微调其催化性能的有效平台。

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