[中文文摘]将脉冲激光束在惰性气氛中溅射石墨产生的等离子体,与一维链状聚甲基硅氧烷的蒸气束流反应 ,在产物中通过真空升华和重结晶分离出了两种单晶,经X射线衍射测定为具有 (CH3SiO1.5) n(n =8,10 )组成的硅氧烷,它们均具有多面体的三维笼状构型 .通过色 -质联用还检测到其它硅氧烷化合物,其中某些产物已表征为二维多环的构型.反应结果表明,经由激光等离子体的碰撞和能量传递,反应物的链状结构发生解离和进一步反应,经结构重组形成了多种不同组成和构型的产物。[英文文摘]A special synthetic reaction has been developed, in which vapor of the reactant interacts with the high temperature plasma generated by laser ablating a graphite target. By selecting chained methylsilicone as reactant, a series of methylsilsesquioxanes products with various structural configurations have been obtained. Among them, two products, which were separated by sublimation in high vacuum and recrystalization, were characterized by X-ray crystal diffraction as (CH_3SiO_ 1.5)_n (n=8,10). Both of them are found to have three-dimensional cage structure.In addition,other products with double ring structure were detected by GC-MS analysis.The results demonstrate the potential application of the synthetic reaction.In the reaction described in this article,resulting from the collision and energy-transfer of the laser plasma,chain structure of the reactant dissociated and recombined to give the cage and ring structure of the product.国家自然科学基金重大项目(29890210)资助课
