VIBRATIONAL SPECTRA OF MONO AND PARA DISUBSTITUTED HALOGENOBENZENES

The infrared and Raman spectra of p-dibromo- and p-difluorotetradeuterobenzene have been measured and sets of assignments for the vibrational fundamentals are proposed. These are shown to be consistent with accepted assignments of related molecules by application of the product and inequality rules. Application of the product rule to the Ag, species of p-dibromobenzene indicates that the assignment of Stojiljkovic and Whiffen is to be preferred to that of Shurvell, Dulaurens and Pesteil. The vapour phase band contour of the band at 816 cm-1 in para C6D4Br2 has been measured in a high temperature cell and shown to necessitate an assignment revision for para C6D4Cl2. © 1969.