The far-IR and Raman spectra of 1,3-dichloro-, 1,3-dibromo-, 1,2,3-trichloro- and 1,2,3-tribromopropane were reinvestigated in solution and in the liquid state in the region 300-30 cm−1. Additional IR and Raman bands were observed, revealing that the compounds had fundamentals below 80 cm−1 attributed to torsional modes. Earlier discrepancies between the torsional modes predicted from electron diffraction measurements and spectral data have been removed.
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