Infrared Spectra of Solid and Matrix-Isolated (CH3)3N, (CD3)3N, and (SiH3)3N

Abstract

The argon‐matrix infrared spectra of (CH₃)₃N, (CD₃)₃N, and (SiH₃)₃N are used to deduce a more complete assignment of the fundamental vibrational modes of these molecules than has previously been possible. Evidence is presented in support of a C_3v rather than C_3h point‐group symmetry for trisilylamine. Barriers to internal rotation are calculated from the observed asymmetric torsional fundamentals of (CH₃)₃N in the solid and matrix phases and of (CD₃)₃N in the gaseous phase.