Infrared and Raman Spectrum of Bromocyclopropane between 3200 and 240 cm−1

Abstract

The infrared spectrum of bromocyclopropane vapor and liquid was scanned between 3200 and 240 cm⁻¹. The Raman shifts and their qualitative degrees of polarization were measured only for the liquid. All 21 fundamentals were assigned and an approximate picture of the motions of those atoms which are mainly involved in the fundamental modes is given. Some of the assignments are supported by the shape of observed and computed band contours and by a comparison in a correlation diagram. In spite of near coincidences of the wavenumbers of the carbon—bromine stretching fundamental and the first overtone of the symmetric carbon—bromine deformation mode, no Fermi resonance was apparent. The solvent shifts of the liquid are positive or negligible for fundamentals above 500 cm⁻¹ and are negative for those below that value.