Étude Par Spectrométrie de Vibration, de L'Interaction Entre Les Halogénures de Trialkylammonium et Quelques Dérivés Phénoliques. II. Vibration vNH+

Abstract

AbstractThe vibrational spectrum of Et3NH+ Cl− and Et3 N H+ Br− has been examined in the v NH+ range. In the solid state, the Raman spectrum shows a well‐defined doublet while the infrared band profile is very large and shows a resonance window fixed at 2510 cm−1. The same effect is observed for both salts dissolved in 1,2 dichloroethane. The formation of hydrogen bonded complexes between the anions Cl− or Br− and some phenol derivatives brings about a frequency shift of the vNH+ band toward higher wavenumbers. This shift depends on the acidity of the phenol derivative and on its concentration. For these complexes, a window also appears at 2510 cm−1; this negative absorption probably arises from a Fermi resonance with the rocking vibration of the methyl group.