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Volumetric properties of the diluted solutions of imidazolium-based ionic liquids in butan-2-ol or butan-2-one

Volumetric properties for ten binary mixtures, containing N3-substituted 1-methylimidazolium chloride ionic liquids, (Cnmim)(Cl) (n = 0, 1, 2, 4, 6) + butan-2-ol or butan-2-one investigated in the molality range of ionic liquids (m = 0.005 to 0.1 mol kg–1), and in temperature range T = (278.15 to 313.15 K) at 5 K intervals. From measured density data, the thermal expansion coefficient, apparent molar volume, partial molar volumes for solvent, and solute, apparent molar volume at infinite dilution, Masson's interaction coefficient, Heppler's coefficient, and limiting apparent molar expansibility were calculated. Masson's equation satisfactorily correlated with the calculated data. Based on the Sv coefficient the interactions between cation and anion of ionic liquids with butan-2-ol or butan-2-one are discussed. Ionic liquids (C0mim)(Cl), (C4mim)(Cl), and (C6mim)(Cl) have structure-making properties, while (C1mim)(Cl) and (C2mim)(Cl) are structure- breaker in butan-2-ol. In butan-2-one solvent, ionic liquid (C0mim)(Cl) is structure-breaker, while the other ionic liquids are structure-maker.

Imidazolium chloride ionic liquids ; Butan-2-ol ; Butan-2-one ; Density ; Volumetric properties

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