Transitions Vibrationnelles De I'Hexamethylenetetramine en Phase Solide

Abstract

The infrared and Raman spectra of polycrystalline hexamethylenetetramine (H.M.T.) at 300 and 80 K have been recorded. For optically active fundamental vibrations the previous data have been fully confirmed; for the observed two-phonons processes it has been found that in some of them all the lattice normal modes (at wave vector different from zero) are involved while for the quasi totality of the other bands (or lines) only the internal vibrations are concerned. From the full assignment of these overtones and combinations the frequencies of all the optically inactive normal modes have been deduced; some of these last results have been found in fairly good agreement with data given by other experiments. The “abnormal” features observed in the infrared spectra of H.M.T. in KBr pellets have been readily related to the formation of a charge transfer complex between H.M.T. with bromide anions.