The infrared spectra and vibrational assignments of the acetyl halides

Abstract

The infrared spectra of acetyl fluoride, acetyl chloride, [²H₃]acetyl chloride, acetyl bromide, and acetyl iodide have been obtained in both the liquid and gaseous phase and frequencies have been assigned to the fundamental vibrations. The assignment for acetyl chloride is in close agreement with that of Overend et al.

The low frequency values associated with the carbon–halogen stretching modes and the high ones associated with ν(CO) are attributed mainly to vibrational coupling.