Raman spectra of S=O vibrations of dimethylsulphoxide in liquid state

Quasiempirical calculations of stable molecular aggregations for dimethylsulfoxide were carried out by MINDO/3 method. The structure of the aggregates and energy of its formation for cases of two, three and four molecules were determined. It was shown that except monomer molecules are possible aggregations from two or three molecules. It was established that the aggregations form by charge interaction of polar molecules. Apparently in liquid state of substance the tendency of aggregation formation remains. The presence of three imposed bands in Raman spectra of S=O vibrations for dimethylsulfoxide was connected, on our opinion, with this. The difference of depolarization ratio for imposed bands is connected with different distribution of charge on S=O bond for different aggregations.

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