Thermal Synthesis of Perchlorinated Oligosilanes: A Fresh Look at an Old Reaction
作者:Felix Neumeyer、Julia I. Schweizer、Lioba Meyer、Alexander G. Sturm、Andor Nadj、Max C. Holthausen、Norbert Auner
DOI:10.1002/chem.201702224
日期:2017.9.7
theoretical study of the high-temperature reaction of SiCl4 and elemental silicon is presented. The nature and reactivity of the product formed upon rapid cooling of the gaseous reaction mixture is investigated by comparison with the defined model compounds cyclo-Si5Cl10, n-Si5Cl12 and n-Si4Cl10. A DFT assessment provides mechanistic insight into the oligosilane formation. Experimental 29Si NMR investigations
提出了SiCl 4与元素硅高温反应的组合实验和理论研究。通过与定义的模型化合物环-Si 5 Cl 10,n- Si 5 Cl 12和n- Si 4 Cl 10进行比较,研究了气态反应混合物快速冷却后形成的产物的性质和反应性。DFT评估提供了对低硅烷形成的机理分析。实验29 Si NMR研究,由量子化学29支持Si NMR计算始终显示该反应产物由离散的分子全氯代低聚硅烷组成。低温氯化法是通过环内Si-Si键断裂将环硅烷转化为无环物种的出乎意料的选择性手段,我们为这一观察提供了机理上的合理化。与此相反的原料,低温氯化后获得的产物代表的有效源新-Si 5氯12或胺稳定的二硅烯EtMe 2 Ñ ⋅的SiCl 2的Si硅烷(SiCl 3)2通过与脂族胺反应。