Department of Chemical Engineering, Texas Materials Institute, and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712-1062, United States.
Langmuir. 2013 Feb 5;29(5):1533-40. doi: 10.1021/la304874y. Epub 2013 Jan 24.
H-terminated Si nanocrystals undergo room temperature hydrosilylation with bifunctional alkenes with distal polar moieties-ethyl ester, methyl ester, or carboxylic acids-without the aid of light or added catalyst. The passivated Si nanocrystals exhibit bright photoluminescence (PL) and disperse in polar solvents, including water. We propose a reaction mechanism in which ester or carboxylic acid groups facilitate direct nucleophilic attack of the highly curved Si surface of the nanocrystals by the alkene.
氢终止的硅纳米晶体在没有光或添加催化剂的帮助下，可在室温下与具有远端极性基团（乙酯、甲酯或羧酸）的双官能烯烃进行氢硅烷化反应。钝化后的硅纳米晶体表现出明亮的光致发光（PL），并分散在包括水在内的极性溶剂中。我们提出了一种反应机制，其中酯基或羧酸基促进烯烃对纳米晶体高度弯曲的硅表面的直接亲核攻击。
