Abstract
Excess molar enthalpies, HijkE of ternary 1-ethyl-3-methylimidazolium tetrafluoroborate (i)+Pyrrolidin-2-one (j)+Pyridine or Water (k); 1-ethyl-3-methylimidazolium tetrafluoroborate (i) 1-methyl pyrrolidin-2-one (j)+Pyridine or Water (k) and HE of Pyrrolidin-2-one (i)+Pyridine or Water (j); 1-methyl pyrrolidin-2-one (i)+Pyridine (j); 1-ethyl-3-methylimidazolium tetrafluoroborate (i)+Water (j) mixtures have been measured over entire mole fraction range at 298.15K. The HijkE value for 1-ethyl-3-methylimidazolium tetrafluoroborate (i)+Pyrrolidin-2-one (j)+Water (k); 1-ethyl-3-methylimidazolium tetrafluoroborate (i)+1-methyl pyrrolidin-2-one (j)+Pyridine or Water (k) are positive over whole range of composition and for 1-ethyl-3-methylimidazolium tetrafluoroborate (i)+Pyrrolidin-2-one (j)+Pyridine (k) mixture, the sign of HijkE values varies with change in composition of the components. The observed data have been analyzed in terms of (i) Graph; and (ii) Prigogine–Flory–Patterson (PFP) theories. Results indicate that HE and HijkE values obtained by Graph theory are in good agreement with experimental data. The PFP theory correctly predict sign as well as magnitude of HE values for the binary mixtures. However, theory fails to predict the sign of HijkE values for the ternary mixtures.
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