Investigating the Solvation Behavior of Some Lithium Salts in Binary Aqueous Mixtures of 1-Ethyl-3-methylimidazolium Tetrafluoroborate ([EMIM][BF<sub>4</sub>]) at Equidistant Temperatures (<i>T</i>= 298.15, 303.15, 308.15, 313.15, 318.15) K
Sapna Rana, Ramesh Chand Thakur, Harpreet Kaur, Akshay Sharma, Renuka Sharma, Vikas Thakur, Harmanjit Singh, Ishrat Fatma
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][BF 4 ]) 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 ( V Ø and V Ø 0 ), apparent and partial molar isentropic compressions ( K Ø, S and K Ø, S 0 ), partial molar volume, and partial molar isentropic compression of transfer (Δ V Ø 0 and Δ K Ø, S 0 ) 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 LiClO 4 and LiI in binary aqueous mixtures of [EMIM][BF 4 ]. Furthermore, Hepler’s criterion has been employed to examine the potential of these salts as a structure maker/breaker.