Solvent effect of ionic liquids on the distribution constant of 2-thenoyltrifluoroacetone and its nickel(II) and copper(II) chelates and the evaluation of the solvent properties based on the regular solution theory

Distribution Equilibria of Amphoteric 8-Quinolinol between 1-Alkyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)imide and Aqueous Phases and Their Effect on Ionic Liquid Chelate Extraction Behavior of Iron(III)

“…This tendency is similar to the case of Htta. 26 On the contrary, the log K′D,H2Q+ (and log KD,H2Q+) values were quite different between the systems. Being concrete, the order of log K′D,H2Q+ value was C2mimTf2N > C4mimTf2N > C6mimTf2N > C8mimTf2N and IL having a more hydrophobic cation showed a lower log K′D,H2Q+ value.…”

“…Actually, anionic tta -showed a quite high affinity to the IL phase. 26 8-Hydroxyquinoline (HQ) is a well-known bidentate extraction reagent. Although there are many papers on use of HQ in IL chelate extraction, [27][28][29][30][31][32][33][34][35][36][37] the distribution behavior of HQ between IL and aqueous phases has not been investigated.…”

Copper extraction using protic ionic liquids: Evidence of the Hofmeister effect

“…A particular advantage of PILs in applications is that, as we discuss below, the coordination of the PIL with the metal ion eliminates the need for the inclusion of a chelating agent in the extraction. This is distinct from most previous studies of the extraction of Cu 2+ to ILs, as these studies generally employ nonprotic ILs and require the use of a hydrophobic chelating agent to solubilize the metal in the IL phase [38][39][40]. Eliminating the need for such an agent offers significant potential advantages in cost and environmental impact in applications.…”

Highly Selective Synergism for the Extraction of Lanthanoid(III) Ions with β-Diketones and Trioctylphosphine Oxide in an Ionic Liquid

“…[7][8][9] Because ILs can also act as liquid ion exchangers, not only neutral but also charged complexes are extractable into the IL phase by ion exchange with the cationic or anionic constituent of the ILs. [10][11][12][13] Thus, the extractability and separability of metal ions in the IL extraction system are expected to differ from those of the usual organic solvent systems. 14,15 Recently, the present authors have reported on the synergistic ionic-liquid extraction of lanthanoids(III) (Ln(III)) with 2-thenoyltrifluoroacetone (Htta) as an acidic chelating extractant and several neutral ligands in 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C4mim][Tf2N]).…”