Proton transfer in amine-hydrogen halide complexes: comparison of low temperature matrices with the gas phase

Abstract

The extent of proton transfer in amine-hydrogen halide complexes is estimated in the gas phase from quadrupole coupling constants and intermolecular stretching force constants derived from rotational spectroscopy and in low temperature matrices from infrared spectroscopic data. The extent of proton transfer for trimethylamine-hydrogen halide complexes is similar in low temperatures matrices to that in the gas phase, whereas that for ammonia-hydrogen halide complexes is significantly greater in an argon matrix (and greater again in a nitrogen matrix) than in the gas phase.