Abstract
1. A study has been made of the infrared absorption spectra of dialkyldithiophosphoric acids containing hydrocarbon radicals of different structure. 2. The valence vibrations of the bonds P= S, P-S, and C-O-(P) correspond to the frequency ranges 651–671, 507–550, and 967–1045 cm−1. 3. The structure of the hydrocarbon radicals has an effect on the position of the absorption bands P= S, P-S, and C -O-(P) in the spectrum. 4. The dependence of the frequencies of the bands vasCH3 and δsCH3 on the structure of the hydrocarbon radicals has been established. 5. The possibility of an analytical application of the region of valence vibration of the carbon structure (1100–1200 cm−1) has been demonstrated. 6. The spectral characteristic obtained for dialkyldithiophosphoric acids can be used to identify dialkyldithiophosphoric acids and, consequently, to establish the structure of the hydrocarbon radicals in zinc dialkyldithiophosphates.
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