イオントラップ型質量分析計中でのCH5+, C2H5+, C3H5+ とハロゲン化ベンゼンとのイオン-分子反応

概要

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Gas-phase reactions of CH5+, C2H5+, and C3H5+ ions with monohalogenated benzenes (PhX = F, Cl, Br, and I) were studied using an ion-trap type of GC/MS at a low chemical-ionization gas pressure of CH4. The major product channel involves dissociative and non-dissociative proton transfer leading to [M + H -- HX + CH4]+ = [PhCH3 + H]+ for PhF, [M + H]+ for PhCl and PhBr, and [M + H -- X]+ = PhH+ for PhI. Adduct ions and their decomposition products are also found in reactions of C2H5+, and C3H5+. The reaction mechanism is discussed based on the reaction-time dependence of product-ion distributions and semi-empirical calculations of the heat of reaction for each process.