engleski

VOLUMETRIC PROPERTIES OF SOLUTIONS OF 1-METHYLIMIDAZOLIUM ACETATE IONIC LIQUID IN WATER, N,N-DIMETHYLFORMAMIDE, N,N-DIMETHYLACETAMIDE, AND DIMETHYL SULFOXIDE

In this report, we studied the volumetric properties (apparent molar volume, standard partial molar volumes, apparent molar volume at infinite dilution, limiting apparent molar expansibilities and Heppler's coefficient) of 1- methylimidazolium acetate, (Mim)(Ac) ionic liquid, IL binary mixtures with two polar aprotic amides: N, N-dimethylacetamide (DMA), and N, N- dimethylformamide (DMF), and one polar aprotic organosulfur and environmentally-friendly solvent: dimethyl sulfoxide (DMSO). Namely, volumetric parameters are calculated from the experimental densities and reported in the temperature range from (278.15 to 313.15) K in water, DMA and DMF or (293.15 to 318.15) K in DMSO at atmospheric pressure (0.1 MPa) and the molality range from (0.0050 to 0.1000) mol kg–1, respectively. The validity of Masson's equation was checked and applied to describe the apparent molar volume dependence on molarity. The apparent molar volume at infinite dilution and interaction coefficient were obtained from this dependence at each temperature. Finally, structure-maker or structure-breaker properties of investigated IL in various solvents are discussed. According to the values of Heppler’s coefficients, (Mim)(Ac) IL, in DMF, DMA, and DMSO could be described as structure-breakers. Values of the Heppler’s coefficient for (Mim)(Ac) in water medium is around zero, so this investigated IL is classified as the borderline.

1-methylimidazolium acetate ionic liquid ; water ; N, N-dimethylformamide ; N, N-dimethylacetamide ; dimethyl sulfoxide ; Masson’s equation ; volumetric properties

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