SOME CORRELATIONS OF THE MOLECULAR STRUCTURE OF ORGANIC PHOSPHORUS COMPOUNDS WITH THEIR INFRARED SPECTRA

The infrared spectra of fourteen organic esters of phosphorus containing dimethylamino groups, and two esters containing diethylamino groups have been examined over the region 5000 to 670 cm.−1 (2 to 15 microns). Correlations have been obtained between absorption band frequencies and the presence of dialkylamino groups in the molecule as an aid to their identification in the spectra of phosphorus compounds. A number of compounds of the pyrophosphate type have been examined and absorption associated with the (P—O—P) linkage has been found in the 950 to 910 cm.−1 (10.5 to 11.0 micron) region. Some criteria are proposed to distinguish absorption by the (P—O—P) linkage in this region.