Vibrational Spectra of Fluorinated Aromatics. IV. 1,2,4,5-Tetrafluorobenzene

Abstract

The infrared absorption spectra of gaseous and liquid 1,2,4,5‐tetrafluorobenzene have been obtained in the region 2–22μ with the aid of LiF, NaCl, and KBr prisms. The Raman spectrum of the liquid phase has 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 the stronger Raman bands. A complete assignment of fundamental vibration frequencies is made and the spectra are interpreted in detail. The values of the nonplanar fundamental frequencies are checked by normal coordinate analysis.