Infrared and Raman Investigation of Condensed Phases of Methylamine and Its Deuterium Derivatives

Abstract

The infrared spectra of solid and matrix‐isolated methylamine, methylamine‐d 2, methyl‐d 3‐amine, and methyl‐d 3‐amine‐d 2 have been recorded from 4000 to 250 cm−1. The Raman spectra of the four isotopic species have also been recorded and depolarization values measured. The elusive NH2 twisting vibration has been located in the solid‐phase infrared spectra of CH3NH2 and CD3NH2, and the assignment is in agreement with both the product rule and earlier assignments for this normal mode in hydrazine. A temperature‐dependent hydrogen‐bonding study has been carried out and ΔH° for H‐bond formation in methylamine‐d 2 was found to be −660 cal/mole.