Densities, refractive indices and conductivities of aqueous [Cnmim][Pro] solutions (n = 4, 8, 12); micellization and the capillary electrophoresis data at 298.15 K

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Abstract

The densities of aqueous solutions of amino acid ionic liquids (AAILs) based on 1-alkyl-3-methylimidazolium cations and L-prolinate anions [Cnmim][Pro] (n = 4, 8, 12) in the concentration range 0-97 wt % were measured at several constant temperatures in the range 293.15-318.15 ± 0.05 K. It has been found that in the range of high AAIL concentrations the dependence of the density values on the AAIL mole fraction for binary water + [Cnmim][Pro] solutions is nonlinear. The refractive indices of aqueous solutions of these AAILs in the concentration range 0-97 wt % and the electrical conductivities of aqueous [Cnmim][Pro] (n = 8, 12) solutions were measured at temperature 298.15K. Critical micelle concentrations (cmc) of AAILs, degree of counterion binding (β), standard Gibbs energy of micellization (ΔG°m) for them were estimated from the experimental data. The dependences of the cmc, β and ΔG°m, on the length of the alkyl chain of the cations were discussed. The synthesized AAILs [Cnmim][Pro] were examined as chiral selectors for the separation of D,L-tryptophan and D,L-tyrosine enantiomers using the ligand exchange capillary electrophoresis. The highest resolution factors Rs are observed in the case of [C4mim][Pro] used as a chiral ligand: Rs = 5.3 for D,L-tryptophan and Rs = 2.2 for D,L-tyrosine.

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Alopina, E., Dobryakov, Y., Safonova, E., Smirnova, N., Kolobova, E., & Kartsova, L. (2018). Densities, refractive indices and conductivities of aqueous [Cnmim][Pro] solutions (n = 4, 8, 12); micellization and the capillary electrophoresis data at 298.15 K. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 544, 137–143. https://doi.org/10.1016/j.colsurfa.2018.02.014

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