Dielectric relaxation study of ascorbic acid solutions in pure dimethylsulfoxide (or diethylsulfoxide) and in dimethylsulfoxide (or diethylsulfoxide)/water mixtures

The complex dielectric spectra of ascorbic acid solutions in pure dimethylsulfoxide (or diethylsulfoxide) and in dimethylsulfoxide (or diethylsulfoxide)/water mixtures have been measured at frequencies between 100 MHz and 20 GHz at 298.15 K. Two kinds of dielectric relaxation processes were observed...

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Bibliographic Details
Published in:Journal of molecular liquids 2011-12, Vol.164 (3), p.207-211
Main Authors: Markarian, S.A., Gabrielyan, L.S.
Format: Article
Language:English
Subjects:
Ascorbic acid
Dielectric relaxation
Diethylsulfoxide
Dimethylsulfoxide
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Summary:The complex dielectric spectra of ascorbic acid solutions in pure dimethylsulfoxide (or diethylsulfoxide) and in dimethylsulfoxide (or diethylsulfoxide)/water mixtures have been measured at frequencies between 100 MHz and 20 GHz at 298.15 K. Two kinds of dielectric relaxation processes were observed in each solution. The low frequency relaxation (Debye term) is assigned to solute. The high frequency relaxation (Cole–Davidson term) is ascribed to practically unaffected solvent. From the results obtained it follows that relaxation time and relaxation strength in DESO containing solutions (i.e. binary AA/DESO and ternary AA/DESO/water systems) are greater than those in DMSO containing solutions. [Display omitted] ► Dielectric relaxation of ascorbic acid/sulfoxide/water mixtures has been studied. ► The low frequency relaxation (Debye term) is assigned to solute. ► The high frequency relaxation (Cole–Davidson term) is assigned to solvent. ► Very strong interaction takes place between DMSO (DESO) and ascorbic acid.
ISSN:0167-7322
1873-3166
DOI:10.1016/j.molliq.2011.09.017