Dielectric Relaxation Study of Some Solutions Containing β-Cyclodextrin and Dimethylsulfoxide
Abstract
Dielectric spectra have been measured up to 72 GHz at 20°C for solutions of β-cyclodextrin (CD) in the following solvents over the whole solubility range of CD: dimethylsulfoxide (DMSO), DMSO/ 1,4-dioxane mixture (2:1 molar ratio), DMSO/water mixtures (2:1 and 1:2). The spectra are analyzed into a sum of Debye type spectral components. These are likely to be caused by different physical pro-cesses. The discussion shows (i) that there is a preferential CD-DMSO interaction, by far exceeding the CD-water interaction, and (») that, concerning CD-DMSO, a loose interaction can be distinguished from the formation of an inclusion complex.
- Publication:
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Zeitschrift Naturforschung Teil A
- Pub Date:
- July 1999
- DOI:
- 10.1515/zna-1999-6-707
- Bibcode:
- 1999ZNatA..54..382B
- Keywords:
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- Association;
- Dielectric Spectroscopy;
- Liquids