Vibrational Spectrum of Fluorotrichloroethylene

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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.