Abstract

PAEZ, Manuel S; VERGARA, María K  and  PEREZ, Omar A. Volumetric properties of DL-Alanine in Aqueous Solutions of 1-Butyl-3-Methylimidazolium Chloride at Temperatures from 283.15 to 313.15 K. Inf. tecnol. [online]. 2015, vol.26, n.5, pp.113-120. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642015000500015.

Densities of aqueous mixtures of DL-alanine + 1-butyl-3-methylimidazolium chloride [Bmim⁺][Cl^-] were measured over the concentration range 0 to 1.0007 mol.kg^-1 at temperatures from 283.15 to 313.15 K at intervals of 5 K, using an Anton Paar DMA 5000 vibrating tube densitometer, within the allowable range of solubility. The infinite dilution apparent molar volume, the second derivative of the infinite dilution partial molar volume with respect to temperature, and the transfer partial molar volume at infinite dilution were calculated. The values of the transfer partial molar volume at infinite dilution are negative. This indicates the predominant interactions between ions of the amino acid and the non-polar groups of the ionic liquid or vice versa. It also was found that the DL-alanine acts as an hydrophilic solute in the pseudo binary mixtures containing the ionic liquid [Bmim⁺][Cl^-].

Keywords : volumetric properties; infinite dilution volume; ionic liquids; DL-alanine.

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