Infrared and Raman matrix isolation studies of methylamine

Abstract

Infrared (4000-50 cm −1) and Raman spectra are reported of methylamine, methylamine- d 1 and methylamine- d 2 trapped in argon and nitrogen matrices at 4–20 K. An anomalous intensity variation was found for the NH 2 wagging mode of methylamine isolated in nitrogen matrices, while in argon matrices the NH 2 wagging absorption exhibited a complex structure due to matrix site effects. A normal coordinate analysis was carried out using a new assignment of the NHD twisting frequency. Barriers to internal rotation in argon and nitrogen matrices, calculated from the observed torsional frequencies, are compared with the gas phase value.