VIBRATIONAL-SPECTRA IN CYCLOPROPANE SERIES .4. ANALYSIS OF THE IR ABSORPTION AND RAMAN-SCATTERING OF CYCLOPROPYL BROMIDE

The Raman spectra of cyclopropyl bromide are measured in substantia and the i.r. spectra both in the gaseous and liquid states. The simultaneous analysis of the rotational envelope of the absorption bands and of the degree of depolarization of the Raman bands lead to the assignment of the 21 fundamentals. This assignment is corroborated by that of the binary combinations and by a normal coordinate treatment. The cyclopropyl bromide fundamentals can be deduced from those of cyclopropane, the observed differences being due essentially to the mass effect and only partly to the chemical character of the substituent. The thermodynamic functions are calculated in a usual harmonic oscillator and rigid rotator approximation. © 1979.