Optical constants and vibrational assignment of liquid toluene-d8 between 4000 and 450 cm at 25 °C

The optical constants (real and imaginary refractive indices) and imaginary molar polarizability spectrum of liquid toluene-d₈ are presented for the first time. The spectra were determined between 4000 and 450 cm⁻¹ at 25 °C. The fundamentals of toluene-d₈ in the liquid phase are revisited with the aid of gas phase spectra of toluene and toluene-d₈, ab initio calculations, and previously reported liquid assignments of toluene.