Abstract
AbstractIn order to address the issue whether both ionic liquids and solvents influence the enthalpy of their solutions, highly accurate excess partial molar enthalpy, values have been measured using Isothermal Titration Calorimeter (ITC). Therefore, thermodynamic behavior has been observed in the mixtures containing ionic liquids. It essentially depends on the molecular structure of the constituents of the mixture. The hydrogen bonding between ionic liquids and ethyl‐substituted solvents (2‐ethoxyethanol, ethylene glycol, diethylamine, ethyl acetate and N,N‐ diethylacetamide) may lead to strong ion‐solvent interactions. In the present study, an effort has been made to quantify various interactions between ionic liquid and solvent, based on the values. Linear solvation free relation shows dependence of limiting excess partial molar enthalpies, upon the solvent properties. Structural orientation of solvent molecules and ionic liquids also described by the values. The ion‐ion, ion‐solvent interactions have also been investigated in terms of the enthalpic interaction parameters, and relative apparent molar enthalpy, φL of ionic liquid‐ethyl‐substituted solvent systems.
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