Abstract
The infrared absorption spectra of gaseous CF2Cl–CHF2 and CF2Br–CHF2 at five temperatures between 30° and 180°C were obtained in the region 300–6000 cm−1 with a Perkin-Elmer double-pass spectrometer equipped with CsBr, NaCl, and LiF prisms. In addition, infrared spectra of the solids at −170°C were recorded in the region 350–5000 cm−1. The Raman spectra of the liquids at 30°, −30°, and −80°C were photographed with a three-prism glass spectrograph of reciprocal linear dispersion 15 A/mm at 4358 A, and polarization measurements were made. In all three states of aggregation both compounds exist as mixtures of rotational isomers. For each compound, the two isomeric forms (trans and gauche) are about equally stable, both in the gaseous and the liquid state. Tentative assignments have been made of the fundamentals of both compounds.
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