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本文以 UV 和~1HNMR 跟踪方法研究了二氯二茂钛(Cp_2TiCl_2)在二甲亚砜中的光化学反应,用自旋捕获技术来捕获 Cp_2TiCl_2催化丙烯腈单体聚合体系中所生成的自由基.UV 和~1HNMR 跟踪结果表明,Cp_2TiCl_2逐渐分解并生成环戊二烯.ESR 测定表明,用自旋捕获剂 PBN 和 BNO 都捕获到了环戊二烯自由基.进一步证明了 Cp_2TiCl_2催化乙烯基单体聚合反应是一种自由基机理.
In this paper, the photochemical reactions of CpTiCl 2 in dimethylsulfoxide were studied by UV and 1HNMR tracing methods. The free radicals formed during the polymerization of acrylonitrile monomer by Cp 2 TiCl 2 were captured by spin trapping technique. The results of UV and ~ 1HNMR showed that Cp_2TiCl_2 was gradually decomposed and cyclopentadienyl was produced.ESR measurement showed that cyclopentadienyl was captured by spin traps PBN and BNO.It was further proved that Cp_2TiCl_2 catalyzed the polymerization of vinyl monomer The reaction is a free radical mechanism.