Modulating the Solubilities of Ionic Liquid Components in Aqueous-Ionic Liquid Biphasic Systems: A Q-NMR Investigation

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Maria AtanassovaI Billard

Abstract

Aqueous-ionic liquid (A-IL) biphasic systems have been examined in terms of deuterated water, acid, and IL cation and anion mutual solubilities in the upper (water-rich, in mole fraction) and lower phase of aqueous/IL biphasic systems at ambient temperature. The biphasic mixtures were composed of deuterated acids of various concentrations (mainly DCl, DNO(3), and DClO(4) from 10(-2) to 10(-4)  M) and five ionic liquids of the imidazolium family with a hydrophobic anion (CF(3)SO(2))(2) N(-), that is, [C1 Cn im][Tf(2)N], (n=2, 4, 6, 8 and 10). The analytical techniques applied were (1) H NMR, (19) F NMR, Karl-Fischer titration, pH potentiometry for IL cations and anions, and water and acid determination. The effects of the ionic strength (μ=0.1 M NaCl and NaNO(3) as well as μ=0.1 M, 0.2 M and 0.4 M NaClO(4), according to the investigated acid), the nature of the IL cation, and the nature of the mineral acid on the solubilities of the (D(2)O, D(+), Tf(2)N(-), C1 Cn im(+)) entities in the lower or upper phases were determined. The addition of sodium perchlorate was found to enhance the Tf(2)N(-) solubility while inhibiting the solubility of the ionic liquid cation. Differences in IL cation and anion solubilities of up to 42 mM were...Continue Reading

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Citations

Sep 18, 2015·Chemical Communications : Chem Comm·Bieke OnghenaKoen Binnemans
Jul 8, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Dr Clotilde GaillardChristoph Hennig
Sep 12, 2015·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Maria AtanassovaIsabelle Billard
Oct 21, 2017·Physical Chemistry Chemical Physics : PCCP·J-M AndansonP Husson

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