Effect of Polyvalent Ions in the Formation of Ionic-Liquid-Based Aqueous Biphasic Systems
authors Kurnia, KA; Freire, MG; Coutinho, JAP
nationality International
journal JOURNAL OF PHYSICAL CHEMISTRY B
keywords SOLVENT RELAXATION PROCESSES; 2-PHASE SYSTEMS; 298.15 K; POLYETHYLENE-GLYCOL; PHASE-BEHAVIOR; SALTING-OUT; COUNTERCURRENT CHROMATOGRAPHY; IMIDAZOLIUM TETRAFLUOROBORATE; VIBRATIONAL-RELAXATION; MUTUAL SOLUBILITIES
abstract Two main approaches were combined aiming at evaluating the impact of polyvalent salt cations on the formation of ionic-liquid-based aqueous biphasic systems (ABS): (1) experimental determination of a large array of ternary phase diagrams composed of sodium-, magnesium-, and aluminum-based salts with 1-butyl-3-methylimidazolium-based ionic liquids and (ii) determination of the ions speciation in each of these systems. The results here reported show, for the first time, that the phase behavior of ionic-liquid-based aqueous biphasic systems is not only dominated by the ability of the strong and "free" salting-out ions to interact with water creating thus hydration complexes but also a result of the interactions occurring between the different ions and, particularly, on their speciation in aqueous solutions. The gathered data indicate that the higher the salt ion valence, the more complex is its speciation with a number of different species in aqueous media present. Further results based on NMR spectroscopy and a proper analysis of the pH influence clearly demonstrated the impact of ion speciation through the phase separation and ABS formation.
publisher AMER CHEMICAL SOC
issn 1520-6106
year published 2014
volume 118
issue 1
beginning page 297
ending page 308
digital object identifier (doi) 10.1021/jp411933a
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000329678000030
link 24328313
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