Dielectric Relaxation and Molecular Structure. IX. Dielectric Behavior of 1-Propanol and 1-Butanol in a Variety of Solvents

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The dielectric constants and losses of 1-propanol and its mixtures with benzene, chlorobenzene, 1,4-dioxane or pyridine, and 1-butanol and its mixtures with benzene or pyridine have been measured in the frequency range of 0.35–2.1 GHz at 25.0 °C. Concentrations of alcohols are 1–0.6 mol fraction of the mixtures. Densities and refractive indices have also been determined. The dielectric data were used to calculate the relaxation times of the alcohols. The Cole-Cole plots for these systems showed Debye-type semicircles in lower frequencies where the principal relaxation of alcohols dominates. Deviations from the semicircle, however, have been observed in the region of upper frequencies, where the second dispersion of alcohol, the dispersion of solvent itself and of hydrogen-bonded species between alcohol and solvent may occur. The principal relaxation times of alcohols calculated from the data of lower frequencies change with concentration in two different manners by solvents, and this difference is due to whether the solvent has hydrogen-bonding capacity or not, and does not depend upon the dielectric constant and/or the polarity of the solvent.
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