Ionic association and solvation of the ionic liquid ۱-hexyl-۳ methylimidazolium chloride in molecular solvents revealed by volumetry and acoustic measurements

Ionic liquids (ILs) are organic salts that are liquids at temperatures below ۳۷۳.۱۵ K. They have received considerable attention as alternatives to the traditional organic solvents. Due to the phenomenal growth of publications dealing with their interesting physical and chemical properties and possible applications they have been attracting intense interest in the scientific literature. In solution, the solvation and ionic association of ILs determine the unique properties of these systems and also most of the applications of ILs are closely related to these phenomena occurred in the IL solutions. In addition, a fundamental issue in the design of novel ionic liquids is the understanding of the nature/strength of cation-anion interactions and intermolecular forces in the bulk ionic fluid due to their intrinsic relation with most of their physicochemical properties, such as melting temperature, density, viscosity, surface tension, and vapor pressure [۱-۳].The ILs based on ۱-alkyl-۳-methylimidazolium cation ([Cnmim]+) are one of the most important and promising class of ILs since they can be used for synthesis of IL with different anions including organic ones [۳]. Among all the imidazolium based ILs, ۱-alkyl-۳-methylimidazolium bromide ionic liquids are the most studied ILs and despite the potential utility of [Cnmim]Cl, few of its physical properties have been reported. In the present work,in order to study of ionic association and solvation behavior of [C۶mim][Cl] as well as their variation with the physicochemical properties of the molecular solvents, volumetry and acoustic measurements for different binary mixtures containing [C۶mim][Cl] + solvent (methanol, ethanol, ۱-propanol, ۲-propanol, ۱-butanol, acetonitrile ,water) at different temperature were carried out.

کلیدواژه ها:

Ionic liquid ، Ionic association ، Solvation ، Volumetry ، Acoustic measurements