Ion/molecule reactions in propyne, 1-butyne and allene by photoionization, ion cyclotron resonance and trapped-ion mass spectrometry

C. Lifshitz, Y. Gleitman, S. Gefen, U. Shainok, I. Dotan

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء

ملخص

Ion/molecule reactions of the title compounds have been studied by several techniques. Several reaction sequences previously observed are verified and additional new ones suggested. The C3H4 isomers demonstrate, among others, the following sequence: C3H4+ → C6H7+ → C7H7+ → C1OH11+. The major primary step for 1-butyne is C4H6(C4H6, CH3)C7H9+. A model is put forward in which proton transfer takes place via a loose collision complex, which is an intermediate step towards formation of a tight ("intimate") collision complex, which in turn is responsible for production of the condensation products. The relatively low rate coefficient for C3H4+ + C3H4 → products in allene, (6.4 ± 0.5) × 10-10 cm3 molecule-1 s-1, as compared to propyne, (15.4 ± 0.5) × 10-10 cm3 molecule-1 s-1, is due to the fact that the propyne reaction system is 12 kcal mol -1 more exothermic. Back- reaction can compete effectively with product formation once the internal energy of the ion is increased but only in allene.

اللغة الأصليةالإنجليزيّة
الصفحات (من إلى)1-16
عدد الصفحات16
دوريةInternational Journal of Mass Spectrometry and Ion Physics
مستوى الصوت40
رقم الإصدار1
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - سبتمبر 1981
منشور خارجيًانعم

بصمة

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