Vibrational frequencies of phosphate derivatives

Abstract

Tri-potassium phosphate, di-potassium monomethyl phosphate and lithium dimethyl phosphate have been found to be ideal model systems on which to base a vibrational analysis of the PO stretching modes in various orthophosphate salt derivatives. We find that a stretching mode which lies about 1200 cm −1 (<8·2 μ) can be used as a characteristic for disubstituted monobasic salts since the highest modes observed for dibasic derivatives lie below 1150 cm −1 ( >8·7 μ).