Investigating the Solvation Behavior of Some Lithium Salts in Binary Aqueous Mixtures of 1-Ethyl-3-methylimidazolium Tetrafluoroborate ([EMIM][BF4]) at Equidistant Temperatures (T= 298.15, 303.15, 308.15, 313.15, 318.15) K

Abstract

In the current work, measurements of density, as well as speed of sound, were made to analyze the solvation behavior of some lithium salts in binary aqueous mixtures of 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]) at equidistant temperatures (T = 298.15, 303.15, 308.15, 313.15, 318.15) K and a pressure of 0.1 MPa. Various thermo-physical parameters like apparent and partial molar volumes (VØ and VØ0), apparent and partial molar isentropic compressions (KØ, S and KØ, S0), partial molar volume, and partial molar isentropic compression of transfer (ΔVØ0 and ΔKØ, S0) were calculated from the experimental data. McMillan–Mayer theory was used to calculate pairwise (AB) and triplet interactions (ABB) from the calculated coefficients. Based on the calculated parameters, the presence and paramountcy of solute-solvent synergy particularly hydrophilic interactions over hydrophobic interactions have been found for both LiClO4 and LiI in binary aqueous mixtures of [EMIM][BF4]. Furthermore, Hepler’s criterion has been employed to examine the potential of these salts as a structure maker/breaker.