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On the Static Electric Permittivity of Aqueous and Non-Aqueous Electrolyte Solutions

Data from the literature for the (extrapolated) static permittivity of solutions of lithium nitrate in various dipolar solvents are discussed with respect to the effects of kinetic depolarization and structure saturation. The solvents are the protic liquids water, methanol, formamide, and N-methylformamide and the aprotic liquids , -dimethylformamide, dimethylsulfoxide, and hexamethylphosphortriamide. The evaluated dielectric decrements are compared with those for some other aqueous and methanolic electrolyte solutions but also with results for (non-conducting) solutions of l,4-diazabicyclo[2,2,2]octane in the various solvents. It is found, that the static permittivity substantially depends on structural properties of the solvent. But it is not clear, to which amount the different molecular mechanisms depend on the solvent structure.