氯代甲苯异构体双电荷离子电子捕获诱导解离谱研究  

A Study on ECID Spectra of Doubly Charged Ions Produced from Four Kinds of Chlorotoluene Isomers

作　　者：邱丰和[1] 刘淑莹[1] 黄承义[1] 张法义[1] 孙宏伟[1] 

机构地区：[1]中国科学院长春应用化学研究所,南开大学中心实验室

出　　处：《高等学校化学学报》1994年第2期271-274,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：研究了４种Ｃ７Ｈ７Ｃｌ异构体在７０ｅＶ电子轰击下产生的［Ｃ７Ｈ７Ｃｌ］（２＋）、［Ｃ７Ｈ６Ｃｌ］（２＋）和［Ｃ７Ｈ５Ｃｌ］（２＋）３种双电荷离子的电子捕获诱导解离（ＥＣＩＤ）反应。分子离子的ＥＣＩＤ反应有明显的邻位效应，表明其结构仍保持中性分子的结构特征；而由各异构体产生的［Ｃ７Ｈ６Ｃｌ］（２＋）和［Ｃ７Ｈ５Ｃｌ］（２＋）离子异构化成同一结构。３种双电荷离子ＥＣＩＤ反应的产物与离子所带电子的奇偶性有关，无论是奇电子离子还是偶电子离子，其解离产物多为偶电子离子。The Electron Capture Indued Decomposition(ECID)spectra of[C7H7Cl]2+,[C7H6Cl](2+) and[C7H5Cl](2+)doubly charged ions produced from four kinds of chlorotoluene isomers in the ion source of mass spectrometer under 70 eV electron impact were studied in this work.The ECID spectra for[C7H7Cl](2+) from o-chlorotoluene can be distinguished with those from other isomers due to the ortho-effect, which implies the structures of the stable doubly charged molecular ions retain the characteristics of those of neutral molecules to some extent,while the ECID spectra for[C7H6Cl](2+) and[C7H5Cl](2+) from the isomers were identical,respectively,which means that the isomerizations occured prior to the decompositions. The dependence of the ECID reactions on whether the parent ion is a odd or even electron ion was also discussed.

关 键 词：双电荷离子 ECIO 氯代甲苯 异构体 

分 类 号：O625.21[理学—有机化学]