A Raman Spectroscopical Study of Molecular Reorientations of (CH₃)₃NHCl in Liquid HCl

Abstract

The reorientational motions of (CH3)3NHCl in liquid HCl are studied. The (CH3)3NHCl molecules are coupled to the solvant by hydrogen bonding, forming complexes of the form:The analysis of the Raman bands of the C‐N vibration of A1 and E symmetry gives the rotational diffusion constants: DL = (0.07 ± 0.015) 1012 s−1 for the reorientation of the cation perpendicular to the molecular symmetry axis, and D|| = (0.16 ± 0.10) 1012 s−1 for the reorientation of the cation about its molecular symmetry axis. The values for the diffusion constants indicate a collision induced relaxation mechanism for both reorientations of the cation.magnified image