Impact of molecular order in Langmuir-Blodgett films on catalysis
Impact of molecular order in Langmuir-Blodgett films on catalysis
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DOI：
10.1126/science.278.5346.2100
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发表时间：
1997-12-19
期刊：
影响因子：
56.9
通讯作者：
Milstein, D
中科院分区：
文献类型：
--
作者：
Tollner, K;PopovitzBiro, R;Milstein, D
制备了铑配合物的催化活性 Langmuir-Blodgett 薄膜并对其进行了表征，以确定金属配合物的分子顺序对催化活性的可能影响。碳-氧双键的氢化被用作模型反应。溶液中的配合物表现出较低的催化活性，而在薄膜中则表现出较高的活性。发现催化活性高度依赖于薄膜内络合物的取向。该反应对于底物也具有高度选择性。这些观察结果和观察到的速率对温度的依赖性强烈暗示金属配合物的分子顺序是催化中的一个重要维度。
Catalytically active Langmuir-Blodgett films of a rhodium complex were prepared and characterized to determine the possible effect of the molecular order of metal complexes on catalytic activity. The hydrogenation of carbon-oxygen double bonds was used as a model reaction. The complex in solution exhibited low catalytic activity, whereas it was highly active in the film. The catalytic activity was found to be highly dependent on the orientation of the complex within the film. The reactions were also highly selective with regard to the substrate. These observations and the observed rate dependence on temperature strongly implicate the molecular order of a metal complex as an important dimension in catalysis.