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The dielectric response of room-temperature ionic liquids: Effect of cation variation

Article Abstract:

The influence of cation variation on the frequency-dependent dielectric permittivity up to 20 GHz of ionic liquids, including pyrrolidinium, pyridinium, tetraalkylammonium, and triethylsulfonium cations mixed with the bis-((trifluoromethyl) sulfonyl) imide anion, is analyzed. It was observed that all spectra exposed a broadly distributed kinetics ranging from the nano- to the picosecond or even subopicosecond range, the non-exponential relaxation, which represented by a broad and unimodal distribution of relaxation times.

Dynamics, Dynamics (Mechanics), Mechanical properties, Dielectric measurements, Dielectric measurement, Pyridinium compounds

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How polar are ionic liquids? Determination of the static dielectric constant of an imidazolium-based ionic liquid by microwave dielectric spectroscopy

Article Abstract:

The study of dielectric constant of ionic liquids was made by using dielectric spectroscopy in the megahertz/gigahertz regime to determine the complex dielectric function of five 1-alkyl1-3-methylimidazolium salts, from which the static dielectric constant epsilon was obtained by zero-frequency extrapolation. The results classified the salts as moderately polar solvents.

Science & research, Research, Spectrum analysis, Spectroscopy, Dielectrics, Dielectric materials

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Dielectric response of imidazolium-based room-temperature ionic liquids

Article Abstract:

Microwave dielectric relaxation spectroscopy is used to study the picosecond dynamics of five low-viscosity, highly conductive room temperature ionic liquid based on 1-alkyl-3-methylimidazolium cations paired with the bis(trifluoromethyl)sulfonyl)imide anion. It is revealed that there is no evidence for orientational relaxation of long-lived ion pairs.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Imidazole, Spectra, Alkyl groups

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