Published Paper Details:

This study explores the thermodynamic behavior of binary mixtures comprising ionic liquids (ILs) and cyclic ethers, focusing on how molecular size, shape, and polarity affect the molar excess enthalpy (H?) and molar excess volume (V?). Two systems--[Bmim][PF?] + tetrahydrofuran (THF) and [C4mim][Cl] + 1,4-dioxane--were investigated across the temperature range of 298.15-318.15 K. Experimental data were modeled using quadratic equations to capture non-ideal mixing behavior. The [Bmim][PF?] + THF mixture exhibited endothermic mixing and moderate volume contraction, indicating weak molecular interactions and inefficient packing. In contrast, the [C4mim][Cl] + dioxane system showed strongly exothermic mixing and significant volume contraction, highlighting the influence of hydrogen bonding and structural compatibility. The parabolic fitting provided detailed insights into the interaction trends as functions of composition and temperature. These findings enhance our understanding of IL-ether interactions and provide predictive tools for designing solvent systems in green chemistry and separation technologies.