The Electronic and Vibrational Spectra of Oxalyl Bromide

The infrared and Raman spectra of oxalyl bromide have been observed. The spectral features suggest that this molecule is planar and trans at room temperature. An assignment has been given for all the fundamental vibrational frequencies. The ultraviolet absorption spectrum of oxalyl bromide has been studied in cyclohexane and in the vapor. The spectrum consists of four absorption systems. These were ascribed to a 3Au(n, π*)←1Ag, a 1Au(n, π*)←1Ag, the second 1Au(n, π*)←1Ag and a 1Bu(π, π*)←1Ag transitions, respectively. Vibrational analyses have been made for the 3Au(n, π*)←1Ag and the first 1Au(n, π*)←1Ag systems.