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The permittivity and loss of solutions of tri(n-buty1)anmoniuni picrate and iodide in various polar solvents have been measured at a number of frequencies between 0.2 and 3.0 GHz. The relative static permittivities of the pure solvents used range from 3.37 to 20.7 at 25°C. For all the soltitioils investigated, the observed dispersion of permittivity is adequately described by a single relaxation time, which for a given solvent depends on the concentration as well as the nature of the solute.Apparent dipole moments evaluated from the dispersion amplitude by means of Bottcher's theory, on the assumption that the dipole occupies a spherical cavity, are 12.3 10.4 D and 11.210.6 D for the picrate and iodide respectiveIy. These values indicate that the relaxing dipole is an ion pair. Dielectric relaxation times corrected for internal field effects by different relations are compared with those calculated from the partial molar volume of the solute and the viscosity of the solvcnt by means of the Debye-Stokes equation. Densitv data for solutions of the two salts in 1 ,Zdichloroethane are included and from these data, partial molar volumes of the salts have been evaluated.

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