Spectroscopic Studies of Rotational Isomerism in Fluorinated Ethanes. I. 1,2-Difluoro-1,1,2,2-Tetrachloroethane

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Abstract
The Raman spectra of solid and liquid CFCl2–CFCl2 have been investigated, and the observed frequency shifts (Δν cm—), relative intensities, and depolarization factors are presented for the latter. The infrared absorption spectra of the liquid in the 2—36‐μ region, and of the solid and vapor in the 2—22‐μ region have also been studied. The behavior of the infrared and Raman spectra as a function of temperature and upon solidification was anomalous in that no changes in the relative intensities of the spectral lines were observed. Two possible explanations of the spectroscopic data are considered, neither of which is completely satisfactory. The assumption of a single molecular species, corresponding to a large energy difference, is apparently in conflict with the number of observed Raman frequencies, while the assumption of two forms of almost equal energy (ΔH<300 calories/mole) is inconsistent with the persistence of all lines upon solidification.

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