Raman spectra of polycrystalline isobutene- d0, isobutene- d6 and isobutene- d8

Abstract

The Raman spectra of polycrystalline isobutene- d 0, isobutene- d 6 and isobutene- d 8 were recorded from 100 to 4000 cm −1. The thirty fundamental modes are assigned on the basis of group frequency correlations, isotopic shift ratios and previously reported infrared band contours. The assignment is discussed in conjunction with existing force fields. Since the low temperature Raman technique for solids is particularly useful for resolving complicated spectral patterns and for detecting weak transitions, it was possible to assign a number of the CH vibrations that were obscured in the spectra of samples in the gaseous and liquid phases.