Vibrational Spectra and Calculated Thermodynamic Properties of 1,1,1,2-Tetrachloroethane and Pentachloroethane*

The infrared absorption spectra of CCl3CH2Cl in the gaseous and liquid states and of liquid CCl3CHCl2 have been obtained in the region from 2 to 38μ with the aid of LiF, NaCl, KBr and KRS-5 prisms. The Raman spectra of these compounds in the liquid state have been photographed with a three-prism glass spectrograph of linear dispersion 15 A/mm at 4358A. Relative intensities and depolarization ratios have been measured for most of the Raman bands. Complete assignments of fundamental vibrational frequencies have been made, the spectra have been interpreted in detail, and thermodynamic functions have been calculated for the compounds in the gaseous state.