氘封端硅纳米颗粒上的热诱导硅氢加成反应：自由基链增长机理的研究

Thermally induced hydrosilylation at deuterium-terminated silicon nanoparticles: an investigation of the radical chain propagation mechanism.

作者信息

Holm Jason, Roberts Jeffrey T

机构信息

Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA.

出版信息

Langmuir. 2009 Jun 16;25(12):7050-6. doi: 10.1021/la8042236.

DOI:10.1021/la8042236

PMID:19425604

Abstract

Isotopic labeling techniques were employed to study alkene addition to hydrogen- and deuterium-terminated silicon nanoparticles. Deuterium-terminated silicon nanoparticle synthesis is described, as is the characterization of fresh deuterium-terminated particles by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and in situ Fourier transform infrared spectroscopy (FTIR). Particles were refluxed in pure 1-dodecene and subsequently characterized by FTIR and nuclear magnetic resonance (NMR) spectroscopy. (1)H NMR results showed features consistent with dodecyl-terminated nanoparticles. Infrared absorption spectra of refluxed particles showed strong evidence of new C-D bond formation, which is consistent with a radical chain mechanism for alkene addition by hydrosilylation.

摘要

采用同位素标记技术研究烯烃与氢封端和氘封端的硅纳米颗粒的加成反应。文中描述了氘封端硅纳米颗粒的合成方法，以及通过透射电子显微镜（TEM）、X射线光电子能谱（XPS）和原位傅里叶变换红外光谱（FTIR）对新鲜的氘封端颗粒进行的表征。将颗粒在纯1-十二碳烯中回流，随后通过FTIR和核磁共振（NMR）光谱进行表征。¹H NMR结果显示出与十二烷基封端纳米颗粒一致的特征。回流颗粒的红外吸收光谱显示出形成新的C-D键的有力证据，这与通过硅氢加成进行烯烃加成的自由基链机理一致。