Infrared Spectra of Tetramethylammonium Halides

Infrared spectra of tetramethylammonium (TMA) halides are discussed with an emphasis on perturbations of the hydrogen vibrational motions caused by anion effects in aqueous solution. The fully deuterated molecule is included in the discussion. The effect of halide anion concentration on the C-H stretching region of the IR spectrum is presented. It is concluded that hydrogen bonding is not the cause of the shift of the wavenumber of these modes.