To study the type, nature, and amount of interactions in binary systems including 1-hexyl-3-methylimidazolium nitrate ([Hmim]­[NO3]) ionic liquid and a homologous series of 1-alkanols (1-hexanol up to 1-decanol), some thermophysical properties via density and viscosity measurements were calculated at temperatures of 293.15–323.15 K. Also, to study the behavior of systems with temperature, values of the thermal expansion coefficient, α, excess thermal expansion coefficient, αE, isothermal coefficient of excess molar enthalpy, (∂H m E/∂P) T,x , and partial molar volume, V̅ i , for five binary mixtures at various temperatures were calculated. Findings demonstrate that strong interactions between the mixture components occur and intermolecular forces become weaker with the increase in the length of the alcoholic chain and temperature. For a theoretical study of mentioned mixtures, perturbed-chain statistical associating fluid theory was implemented. The density and partial molar volume of mixtures were correlated and predicted by this theory, and the results show that outcomes are fairly consistent with the experimental data.

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