Raman spectra of gases. XIX–The low frequency gaseous phase Raman spectra and the barriers to internal rotation of the 1,1,1‐trifluoroethyl halides

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Abstract
The gaseous phase Raman spectra of CF3CH2I, CF3CH2Br, CF3CH2CI and CF3CH2F have been investigated and the barriers to internal rotation determined. The torsional fundamentals were observed to be unusually strong, depolarized bands, and several Δν = 2 torsional transitions were measured for all compounds. Torsional transitions originating from excited states of the skeletal bend were also observed for CF3CH2CI and CF3CH2F. The torsional barriers found were: CF3CH2I, 4.16 ± 0.11; CF3CH2Br, 4.39 ± 0.07; CF3CH2CI, 4.88 ± 0.03 and CF3CH2F, 3.58 ± 0.14 kcal mol−1.