INFRARED STUDY OF PERFLUOROVINYLPHOSPHONIC ACID, PERFLUOROALLYLPHOSPHONIC ACID, AND PENTAFLUOROALLYLDIETHYLPHOSPHONATE

Transmission infrared spectra of three fluorinated phosphonate monomers, perfluorovinylphosphonic acid, perfluoroallylphosphonic acid, and pentafluoroallyldiethylphosphonate, are presented and discussed. Characterization of such compounds by infrared spectroscopy is difficult, because considerable overlap occurs between absorptions arising from C-F stretching vibrations and absorptions arising from phosphonate moieties. Detailed band assignments were made on the basis of subtle similarities and differences in the structures of the compounds, such as degree of fluorination and intermolecular hydrogen bonding. The detailed identification of the absorption bands in the infrared spectra of PVPA, PAPA, and PADP provided by this report should be of assistance in subsequent infrared studies of similar compounds and polymers prepared from them.