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- W2955910591 abstract "It is important to understand the mechanisms and general rules of ion partitioning in hydrophobic ionic liquid (IL)/water biphasic systems in order to predict the extractability of an ionic species with various ILs. In this study, we have investigated the partition of picrate ion (target anion, T–) from aqueous sodium picrate solutions into several ILs and the accompanying changes in aqueous concentrations of the IL component cation (C⁺) and anion (A–) at 298.2 K. The main ILs examined are 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide, 1-butyl-3-methylimidazolium hexafluorophosphate, and 1-methyl-3-octylimidazolium bis(trifluoromethanesulfonyl)amide. The aqueous concentrations of C⁺ and A– decreased and increased, respectively, with the extraction of T– into the IL phase. From the standpoint of equilibrium, the partition behavior of T– can be explained both by the anion exchange with A– in the IL phase and by the ion pair extraction with C⁺ in the aqueous phase. The aqueous concentrations of C⁺ and A– are governed by the solubility product of the IL (Kₛₚ). The distribution ratio of T– is expressed as a function of Δ[T–]W, namely, the difference between the initial and equilibrium concentrations of T– in the aqueous phase; the distribution ratio of T– is nearly constant when Δ[T–]W ≪ Kₛₚ¹/², but decreases with increasing Δ[T–]W in the larger Δ[T–]W region. The equilibrium constants of the ion pair extraction and the ion exchange extraction have been determined for picrate and other phenolate ions whose partition data were previously reported. The dependences of the extraction constants and extractability on the kinds of IL component ions can be quantitatively explained on the basis of the variations of Kₛₚ." @default.
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- W2955910591 date "2012-01-01" @default.
- W2955910591 modified "2023-09-23" @default.
- W2955910591 title "Mechanisms and Rules of Anion Partition into Ionic Liquids: Phenolate Ions in Ionic Liquid/Water Biphasic Systems B" @default.
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