The crystal and solution vibrational spectra of biphenyl

Abstract

The infrared absorption spectra of single crystals of biphenyl, measured with polarized radiation, are here reported. These and the close similarity of the spectra to those of monosubstituted benzenes are used in assigning the vibrational frequencies of biphenyl and deca-deutero-biphenyl on a pseudo C 2 v model. The Raman spectrum of crystalline biphenyl has been remeasured and confirms that recorded by Aziz. The crystal spectra are interpreted in terms of the crystal structure and the differences in the interactions between the bonded rings in the solution and crystal phases.