The Infrared Spectra of Metal Dialkylphosphorodithioates

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Abstract
The infrared spectra of eight zinc dialkylphosphorodithioates and four potassium dialkylphosphorodithioates have been examined The infrared spectra of the zinc, cadmium, copper, nickel, and potassium salts of a mixed dialkylphosphorodithioate have been studied and compared to the spectrum of the parent acid. The P-O-C absorption of all of these compounds is found to occur about 25 cm−1 lower in frequency than in compounds containing the P = 0 group. The thiophosphoryl group (P = S) is found to occur at 635–668 cm−1 both for the free acid and the covalent salts. It occurs at a higher frequency, 675–702 cm−1 for the more ionic potassium salt. The P— S—(M) absorption occurs at 510–556 cm−1.