Substituted Methanes. XXIX. Vibrational Spectra, Potential Constants, and Calculated Thermodynamic Properties for Dibromochlorofluoromethane and Bromodichlorofluoromethane

Abstract

Raman displacements, semiquantitative relative intensities, and quantitative depolarization factors for the Raman lines of the liquid, and wave numbers and estimated relative intensities for the infrared bands of the gas and liquid in the region 400 to 3000 c/cm (cycles/cm), were obtained for CBr2ClF and CBrCl2F. Assignments of the observed bands were made and reasonable sets of potential energy constants were determined by use of the Wilson FG matrix method and the procedure of Gold, Dowling, and Meister. Finally, the thermodynamic properties—heat content, free energy, entropy, and heat capacity—were calculated from the spectral and structural data for 12 temperatures from 100 to 1000°K.