Abstract
The static dielectric permittivity εS (“static dielectric constant”) is an important quantity for characterizing the solvation capability of a solvent. The past two decades have seen the advent of ionic liquids — low-melting organic salts — as intriguing alternatives to volatile organic solvents. While for non-conducting media εS is readily measured by electrical capacitance methods, such methods fail for electrical conductors because the samples are short-circuited by their intrinsic electrical conductivity. In dielectric theory εS is defined as the zero-frequency limit of the real part of the frequency-dependent complex dielectric permittivity. This definition provides a recipe to determine εS by dielectric relaxation spectroscopy. The paper reviews the achievements in characterizing and understanding the static dielectric constant of Ionic Liquids with particular focus on work in the author's laboratory.
Published Version
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