Study of solute‐solvent interactions of 1‐hexyl‐3‐methylimidazolium bromide [C ₆ mim][Br] and protic solvents at different temperatures: A volumetric approach

Volumetric properties offer direct and sensitive insight into the specific interactions between solute and solvents. In the current work, key volumetric parameters—partial molar volume (PMV), apparent molar volume, excesspmv, and PMV at infinite dilution—were computed for three binary mixtures of 1‐hexyl‐3‐methylimidazolium bromide ([C 6 mim][Br]) with protic solvents: water, ethylene glycol monomethyl ether (EGMME) and isopropyl alcohol (IPA) across a range of temperatures. The dependence of these properties on concentration and temperature was analyzed to assess the nature and strength of solute–solvent interactions in these mixtures. The effect of the hexyl chain of the methylimidazolium cation on the solute‐solvent interactions was also investigated. Additionally, the Flory statistical theory (FST) was employed to predict, and the Jouyban‐Acree model (JAM) was used to correlate the molar volume of the given mixtures. It was found that JAM is a suitable model to correlate the molar volume for the given mixtures in the given concentration and temperature range. FST yielded accurate predictions of molar volume for the [C 6 mim][Br] + EGMME and [C 6 mim][Br] + water systems across the entire range of composition and temperature, though its applicability to the [C 6 mim][Br] + IPA system was limited to mole fractions X 1 >0.1.