Vibrational Spectrum of Fluorotrichloroethylene

Abstract

The infrared spectrum of gaseous fluorotrichloroethylene, FClC:CCl₂, has been obtained in the range 3—50 microns. The Raman spectrum of a liquid sample has also been determined. Earlier data and new force constant calculations for some other fluorochloroethylenes are reviewed and used to establish a satisfactory vibrational assignment for FClC:CCl₂. The planar fundamentals appear at 1645, 1181, 988, 857, 520, 407, 358, 250, and 174 cm^—1; the out‐of‐plane vibrations occur at 537, 313, and probably near 130 cm^—1. A necessary revision in the existing assignment for F₂C:CCl₂ is indicated. A table of the thermodynamic functions is given for FClC:CCl₂ in the ideal gaseous state.