Low Temperature Infrared Study of Association in Dissolved Dimethylamine

Abstract

The fundamental, first, and second overtone of the NH stretching vibration of dimethylamine were measured at temperatures ranging from 22 to -190°C, in solvents forming rigid glasses at low temperatures. The self-association of dimethylamine was examined. At room temperature only monomers and dimers were found while at low temperatures a more highly associated species is also observed. The overtones of the dimer were observed at low temperatures and lead to normal anharmonicities.