飞行时间质谱仪中激光解离的Ni^＋与醇类化合物分子束流气 …

将分子束流，激光解离和飞行时间质谱结合起来，在一个石英反应室内，让激光解离的Ｎｉ＾２＋与连续喷入的醇分子不流发生反应，产物经飞行时间质谱仪检测，研究了Ｎｉ＾＋一Ｃ２～Ｃ６等五种醇分子的气相反应。用如下的插入机理解释反应：（１）选择性的插入醇分子共价键；（２）β－Ｈ迁移至Ｎｉ＾＋；（３）失去一中性分子形成产物离子。

Studies on the gas phase reaction of ablated Ni+ with molecular flows of alcohols in the time-of-flight mass spectrometer]

A apparatus combining molecular flows, laser ablation and time-of-flight mass spectrometer was first designed, in which the gas phase reactions of metal ions with organic compounds were realized. In a small quartz cell of it, laser ablated Ni+ meet and react with molecular flows of alcohols, and their product ions were detected by the time-of-flight mass spectrometer. The gas phase reactions of Ni+ with C2-C6 alcohols were studied. All of which can be explained by the following mechanism: (1) Insertion of Ni+ into bonds of alcohols; (2)Following each insertion, a beta-hydrogen shift onto Ni+ to produce intermediate; (3) Dessociation of each intermediate by loss of neutral molecular to give product ion.