Unveiling the Molecular Interactions of Ionic Liquids in Aqueous Solutions through Volumetric and Compressibility Approach

Abstract

newlinexxv newlineAbstract newlineThe exploration of ionic liquids (ILs) in aqueous solutions has become a focal point of modern newlineresearch due to their remarkable physicochemical properties and their potential applications in newlinediverse domains such as green chemistry, catalysis, electrochemical devices, and separation newlinetechnologies. Despite extensive studies, a thorough understanding of the molecular interactions newlinebetween ILs and various aqueous solutions remains elusive. This thesis aims to bridge this newlineknowledge gap by employing a detailed volumetric and compressibility approach to unveil the newlinemolecular interactions of ILs in aqueous solutions. newlineThis research systematically investigates the volumetric and acoustic properties of aqueous newlinesolutions of various ionic liquids, focusing on the interpretation of some key and derived newlinethermodynamic parameters. The study encompasses measurements of the density and sound newlinevelocity of ILs ([EMIm][MeSO4], [BMMIm][Cl], [Bmim][OcOSO3], [EMIm][DEP], and newline[HEMIm][Cl]) in aqueous and aqueous co-solute (L-alanine, glycine, NaCl, and D-glucose) newlinesolutions across a range of concentrations at different temperatures. These data are utilized for the newlinecalculation of apparent molar volumes of solutes, limiting apparent molar volumes of solutes, newlinetransfer limiting apparent molar volumes of solutes, apparent molar expansivity of solutes, thermal newlineexpansion coefficient of solution, Hepler constant of solutes, isentropic compressibilities of newlinesolution, apparent molar isentropic compressibility of solute, limiting apparent molar isentropic newlinecompressibility of solute, transfer limiting apparent molar isentropic compressibility of solute and newlinehydration number. These parameters provide deep insights into the solvation dynamics, ion-pairing newlinephenomena, and structural reorganizations within the solution. newlineThe experimental data reveal distinct trends in the volumetric properties of ILs, highlighting the newlineinfluence of the ionic nature, hydrophobicity, and size of the IL constituents on their behavior in newlineaqueo