Effect of temperature on molecular interactions between tri(butyl)methylphosphonium methylsulfate and furfural

In this work, the effect of temperature on the molecular interactions between tri(butyl)methylphosphonium methylsulfate ([P4441][CH3SO4]) and furfural were studied over the entire composition range, temperature ranging from (293.15 to 323.15) K and at pressure 0.1 MPa, using the measured density (ρ), ultrasonic sound velocities (u) and viscosity (η) data. The excess molar volumes (VE), partial molar volumes ( V ¯ 1 and V ¯ 2 ), excess partial molar volumes ( V 1 E ¯ and V 2 E ¯ ), deviation in isentropic compressibilities (Δκs) and the deviation in viscosities (Δη) were evaluated using these properties as a function of the concentration of IL. The Redlich-Kister polynomial was used to correlate the VE, Δκs and Δη data. The intermolecular interactions and structural effects are analysed on the basis of the measured and derived properties. Such knowledge about the intermolecular interactions which occur between ([P4441][CH3SO4]) with furfural is beneficial in the development of structure–property correlations as well as new predictive models.