Optical constants, and vibrational assignment of liquid bromobenzene-d5 between 4000 and 400 cm-1 at 25°C

The complex refractive index and imaginary molar polarizability spectra of liquid bromobenzene-d5 are presented for the first time. The complex refractive indices were determined from transmission measurements in cells with pathlengths between 11 and 5000 mu m using standard methods described in the literature. The wavenumbers in the imaginary molar polarizability spectrum were used along with the vibrational assignment of gaseous bromobenzene-d5 in the literature to assign the fundamentals of liquid bromobenzene-d5. The literature assignment of the CD stretches for gaseous bromobenzene-d5 is not consistent with the assignments of the CH stretches for other monosubstituted benzenes. This leaves a shadow of uncertainty over the assignments of CD stretches that can not be resolved in the present work. This will be explored in a future paper, once the fitting of the imaginary molar polarizability spectrum of liquid bromobenzene-d5 is complete.