Electrical Conductivity and Association of 1-butyl-3-methylpyridinium bis{(trifluoromethyl)sulfonyl}amide in Some Polar Solvents

Abstract

The influence of alternating current frequency in the determination of the electrical conductivity of ionic liquids’ (ILs) dilute solutions in polar solvents has been considered. The frequency ranges in which the influence of polarization processes on electrodes occur and ionic relaxation occurs in the bulk of the solution have been excluded from the results of the electrical conductivity measurements. The association constants for K_a ILs in polar solvents published in literature were analyzed. A discrepancy between the values of K_a was noted, which is associated with the use of different calculation equations for electrical conductivity and the insufficiently correct consideration of the frequency dependance of the measured resistance. Based on the measured values of the electrical conductivity of dilute solutions of 1-butyl-3-methylpyridinium bis{(trifluoromethyl)sulfonyl}amide ([Bmpy][NTf₂]) in acetonitrile (AN), dimethyl sulfoxide (DMSO) and dimethylformamide (DMF) in the 20--65 °C temperature range, the thermodynamic characteristics of the [Bmpy][NTf₂] association were determined. The effect of temperature on the molar electrical conductivity of [Bmpy][NTf₂] at infinite dilution λ₀ and the association constant K_a have been considered. The Walden product (λ₀η), where η is the viscosity of the solvent, was also analysed. It was shown that in AN, DMSO, and DMF, λ₀η changes in different ways with increasing temperature; however, the value of λ₀η/(εT) corrected for permittivity ε and absolute temperature T does not depend on the temperature and nature of the solvent. As the temperature rises, the electrical conductivity of the dilute solutions of [Bmpy][NTf₂] increases in direct proportion to the ratio of the permittivity to dipole dielectric relaxation time of the solvent

The work is performed in the framework of the development program Prioriyty 2030 of the Mendeleev University of Chemical Technology of Russia

Please cite this article as:

Karpunichkina I.A., Artemkina Yu.M., Plechkova N.V., et al. Electrical conductivity and association of 1-butyl-3-methylpyridinium bis{(trifluoromethyl)sulfonyl}amide in some polar solvents. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2023, no. 3 (108), pp. 145--163. DOI: https://doi.org/10.18698/1812-3368-2023-3-145-163

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