Physicochemical studies of intermolecular interactions in 1-butyl-3-methylimidazolium tetrafluoroborate + benzonitrile binary mixtures at temperatures from 293.15 to 318.15 K

ABSTRACT

The densities, ρ, speeds of sound, u, viscosity, η and refractive indices, n_D of 1-butyl-3-methylimidazolium tetrafluoroborate [Bmim][BF₄] and Benzonitrile (BN) binary mixture, including those of pure liquids have been measured over the entire composition range at temperatures (293.15, 298.15, 303.15, 308.15, 313.15 and 318.15 K) and at atmospheric pressure. From the experimental values, excess molar volumes, $V_{\mathrm{m}}^{\mathrm{E}}$, excess isentropic compressibilities, ${\kappa }_{\mathrm{s}}^{\mathrm{E}}$, excess speeds of sound, $u^{\mathrm{E}}$, excess molar isentropic compressibilities, $K_{\mathrm{s},\mathrm{m}}^{\mathrm{E}}$ and deviations in viscosity, Δη, deviations in refractive index, ${\mathrm{\Delta }}_{\varphi }{n}_{\mathrm{D}}$ and deviations in molar refraction, $\mathrm{\Delta }{R}_{\mathrm{M}}$ were calculated. The partial molar volumes and partial molar isentropic compressibilities along with their excess values over whole composition range and those of the components at infinite dilution were also calculated. The resultant positive or negative deviations of these parameters have been analysed in terms of molecular interactions prevailing in these mixtures. The applicability of Prigogine–Flory–Patterson (PFP) theory in predicting the $V_{\mathrm{m}}^{\mathrm{E}}$ values is checked.

KEYWORDS:

• Density
• viscosity
• speed of sound
• refractive index
• 1-butyl-3-methylimidazolium tetrafluoroborate
• benzonitrile
• PFP theory
• intermolecular interaction

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Acknowledgements

The author (NC) is thankful to the Head, Department of Chemistry, University of Delhi, Delhi, India for award of UGC departmental fellowship and providing facilities.

Disclosure statement

No potential conflict of interest was reported by the authors.

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