Infrared and Raman Spectra of Fluorinated Ethanes. IV. The Series CH3–CH3, CH3–CH2F, CH3–CHF2, and CH3–CF3

Abstract

The infrared spectra of ethyl fluoride and 1,1-difluoroethane vapors have been obtained in the egion from 2 to 38μ, and the spectra of the liquids from 2 to 22μ, with the aid of LiF, NaCl, KBr, and KRS-5 prisms. The Raman spectra of both compounds were studied in the liquid phase with a three-prism glass spectrograph of linear dispersion 15A/mm at 4358A. Depolarization ratios were determined for the stronger bands. The Raman spectrum of 1,1-difluoroethane was also obtained for the gaseous phase. A complete assignment of fundamental frequencies is proposed for each molecule and used in a detailed interpretation of the spectra and for the calculation of thermodynamic functions over the temperature range 298–600°K and at the boiling point.