The study of interactions in aqueous solutions of 1-alkyl-3-(3-butenyl) imidazolium bromide ionic liquids

In the present study, volumetric and viscosimetric properties of aqueous solutions of imidazolium-based ionic liquids (ILs) with unsaturated and variety of different alkyl chain lengths, 1-alkyl-3-(3-butenyl) imidazolium bromide (([RC3=Cim][Br]), R = methyl (C-1), ethyl (C-2) or butyl (C-4)) were investigated. The experimental density and viscosity are measured as a function of the IL concentration at T = (293.15 to 313.15) K and atmospheric pressure (p = 101325 Pa). The volumetric property analysis is done to adjudge the effect of the introduced double bond, length of the alkyl chain on the imidazolium ring and hydrophilic non-hydrolyzable anion environment on the overall volumetric changes at infinite dilution. The experimental viscosity data are analyzed using the Jones-Dole equation to evaluate the viscosity B-coefficients. The results are discussed in terms of the interactions occurring in solution and compared with that available in the literature for corresponding saturated analogues. (C) 2021 Elsevier Ltd.

Automated summary

The volumetric and viscosimetric properties of aqueous solutions of imidazolium-based ionic liquids with unsaturated and different alkyl chain lengths were investigated in this study. The effects of the introduced double bond and alkyl chain length on the overall volumetric changes at infinite dilution were analyzed, along with evaluating viscosity B-coefficients. The study discussed interactions in solution and compared results with literature for corresponding saturated analogues.