Synthesis and study of ionic interactions by volumetric, transport, FT-IR and computational methods of alkyl imidazolium acetate ionic liquid with molecular solvents (DMSO, DMF & EG) at T = (293.15–363.15) K

Abstract

In this work, the ionic liquid (IL) 1-octyl-3-methylimidazolium acetate [C1C8IM][OAc] was synthesized through the neutralization process followed by metathesis method. The experimental density (ρ) and viscosity (η) of the pure components as well as binary solutions of IL with molecular solvents such as dimethyl sulfoxide (DMSO), dimethylformamide (DMF) and ethylene glycol (EG) have been measured as a function of concentration of IL in terms of molality at T=(293.15–363.15) K and at 0.1Mpa pressure. From the experimental density data apparent molar volumes (VΦ), apparent molar volumes at infinity dilution (VΦ∞), apparent molar limiting parameter (Sv) and apparent molar expansibility (EΦΟ) were calculated with the help of Redlich-Mayer equation. The experimental viscosity data was analyzed by using the Jones-Dole equation to evaluate the empirical coefficients (A and B). The obtained parameters were analyzed to understand the ion-solvent or ion-ion interactions of studied binary solutions at various temperature ranges. In addition, FT-IR spectroscopy study was performed to justify the hydrogen bonding interactions. Density functional theory (DFT) was performed to understand the intra-ionic and inter-ionic interactions between the IL and molecular solvents. The subsequent FT-IR and computational results were good agreement with experimental data.