Ion-Molecule reactions in methylamine and dimethylamine and trimethylamine systems

Abstract

Fourier transform ion cyclotron resonance mass spectrometry has been used to measure the reaction rates for ions derived from methylamine with dimethylamine or trimethylamine. The use of the selective ion ejection technique greatly simplifies the elucidation of the ion-molecule reaction channels. The rate constants for proton transfer from protonated metwlamine, CH3NH 3 (+) (m/z 32), to dimethylamine and trimethylamine are 16.1 ± 1.6 × 10(-10) and 9.3 ± 0.9 × 10(-10) cm(3) molec(-1)s(-1), respectively. The rate constants for charge transfer from methylamine molecular ion, CH3NH 2 (+) (m/z 31), to dimethylamine and trimethylamine are 9.3 ± 1.8 x 10(-10) and 15.0 ± 5 × 10(-10) cm(3)molec(-1)s(-1), respectively.

An ICR mass spectrometry study of ion/molecule reactions between ethyl chloride and alkylamines

“…AH, = -46.9 kJ mol-' As for reaction [2] the low concentration of this impurity (<0.1%) should give at 400 ms a contribution to the fractional intensity of approximately 0.04 (13), which is small compared to the experimental value of 0.33 in Fig. 1.…”