Integral intensities have been measured for the C-O-(P), P=S, and P-S bands in the spectra of potassium, barium, zinc, nickel, and lead dialkyldithiophosphates containing hydrocarbon radicals of various structures.
Characteristicity has been established for the integral intensity of the C-O-(P) vibration, and noncharacteristicity for the integral intensities of the P=S and P-S vibrations.
The characteristicity of the integral intensity of the C-O-(P) bands is a consequence of the characteristicity of the form of the C-O-(P) vibration. The noncharacteristicity of the P=S and P-S bands indicates noncharacteristicity of the form and frequency of the P=S and P-S vibrations.
The dependence of the integral intensities of the P=S, P-S, and C-O-(P) bands on the nature of the metal and the structure of the hydrocarbon radical can be used for reliable identification of dialkyldithiophosphates contained in lubricating oils.
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Kotova, G.G., Zimina, K.I. Intensity of characteristic bands in spectra of metal dialkyldithiophosphates. Chem Technol Fuels Oils 9, 405–407 (1973). https://doi.org/10.1007/BF00729157