15875-95-3Relevant academic research and scientific papers
Hydrogen bonding solvent effect on the basicity of primary amines CH3NH2, C2H5NH2, and CF3CH2NH2
Lau, Yan K.,Kebarle, P.
, p. 151 - 155 (2007/10/02)
The equilibria RNH3+(H2O)n-1 + H2O = RNH3+(H2))n were measured for R=CH3, C2H5, and CF3CH2 from n=1 to n=3 with a pulsed electron beam high ion source pressure mass spectrometer.The proton and hydrate transfer equilibria CH3NH3+(H2O)n + C2H5NH2 = CH3NH2 + C2H5NH3+(H2))n were measured for n=0 to n=3.These data allow the evaluation of ΔH0 and ΔG0 for the reactions: R0NH3+(H2))N + RNH3+ = R0NH3+ +RNH3+(H2O)n. ΔH0=δΔH00,n(RNH3+),ΔG=δΔG00,n(RNH3+).These data are compared with δΔE0,3(STO-3G) evaluated by Hehre and Taft.In general good agreement is observed at n=3.The δΔH00,3(RNH3+) ca. δΔE0,3(RNH3+)are also found close to the ion hydration free energy difference in aqueous solutions.
