Abstract
Raman spectroscopy was used to study intermolecular interactions in liquid dimethyl sulfoxide. The non-coincidence of the vibrational wavenumbers of the in-phase and the out-of-phase SO stretching mode was analyzed in the temperature range of 30 – 70 °C under pressures up to 2200 bar. The observed non-linear increase of this splitting parameter as a function of density can be explained by an increase in local order leading to an enhanced coupling of neighboring oscillators. The isotropic SO stretching vibrational band consists of three components which are attributed to clusters differing in intermolecular association strength. The pressure dependence of the integrated intensities of the three SO band components is interpreted as a pressure-induced formation of clusters consisting of strongly associated molecules.
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Czeslik, C., Jonas, J. (1999). Pressure-Enhanced Molecular Clustering in Liquid Dimethyl Sulfoxide Studied by Raman Spectroscopy. In: Winter, R., Jonas, J. (eds) High Pressure Molecular Science. NATO Science Series, vol 358. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4669-2_15
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DOI: https://doi.org/10.1007/978-94-011-4669-2_15
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