Temperature dependent study of thermophysical properties of binary mixtures of imidazolium based ionic liquids with cyclic amides

Sunkara, Govardhanarao ; Tadikonda, srinivasa Krishna; Narendra, K


The experimental values of densities (r) and speeds of sound (u) of the binary mixtures of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate [Bmim][BF4] with cyclic amides 2-Pyrrolidinone(2-PY) andN-Vinyl-2-pyrrolidone (NVP)have been used to calculate the internal pressures ( ), free volumes (Vf), excess internal pressures ( ), excess free volumes ( ), excess free energy ( ), excess enthalpy ( ) and excess entropy ( )covering the entire composition range expressed by mole fractions of ionic liquid at temperatures (298.15-323.15 K). The results have been interpreted in terms of intermolecular interactions between the component molecules in the mixture. The variations of these excess properties with composition indicate that the interactions between [Bmim][BF4] and cyclic amides in these mixtures follows the order: NVP>2-PY.


1-Butyl-3-methylimidazolium tetrafluoroborate [Bmim][BF4]; cyclic amides; excess thermodynamic properties; molecular interactions

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