Proton transfer reactions by trapped-ion mass spectrometry

摘要: Rate coefficients for reaction of CH5+ and C2H5+ (and/or deuterated analogues) with NH3, CH3NH2, (CH3)2NH, CH3Cl, n-C3H7Cl, i-C3H7Cl, CH3OH have been measured using trapped-ion mass spectrometry. The rate are much higher than predicted on the basis ion-induced dipole interactions only, but in reasonable agreement (within 30%) collision calculated by average orientation (ADO) theory ion-polar molecular reactions. proton transfer RX = H2N, CH3NH, (CH3)2N, CH3O. symmetric approximately one-half coefficients, consistent formation a complex consisting di-solvated having equal probabilities being associated either molecule when dissociates. Equilibrium constants sixteen two-component systems oxygen-containing molecules. From ΔG° values obtained, relative affinities established (C2H5)2O, CH3CO2C2H5, CH3CO2CH3, (CH3)2CO, HCO2CH- (CH3)2, HCO2CH2CH2CH3, HCO2C2H5, (CH3)2O, HCO2CH3, C2H5OH, CH3CHO. results indicate that such polar molecules can be ion trapping technique to ±0.2 kcal mole−1