Task‐Specific Ionic Liquids Bearing 2‐Hydroxybenzylamine Units: Synthesis and Americium‐Extraction Studies

Abstract

The synthesis of two task-specific ionic liquids (TSILs) bearing 2-hydroxybenzylamine entities is described. These compounds are based on an imidazolium substructure onto which one hydrobenzylamine-complexing moiety is grafted. We have demonstrated that, whether pure or diluted, TSIL is able to extract americium ions. Furthermore, recovery of americium from the IL phase into a receiving phase can be achieved under acidic conditions. A possible mechanism for the metal-ion partitioning is presented, in which the extraction system is driven by an ion-exchange mechanism.

Selective Extraction of Copper, Mercury, Silver, and Palladium Ions from Water Using Hydrophobic Ionic Liquids

“…[22][23][24][25] Task-specific ionic liquids (TSIL), can extract cations without ion-exchange. [26][27][28] TSILs are ionic liquids with functional groups appended to the cation. Some TSILs appear to be efficient for extraction with high selectivity for some metal ions such as mercury, cadmium, 27,28 or actinides.…”

“…Some TSILs appear to be efficient for extraction with high selectivity for some metal ions such as mercury, cadmium, 27,28 or actinides. 26 In this work, we investigate the ability of selected ionic liquids to extract offensive or valuable cations from water. We have studied the extraction properties of ten ionic liquids: 1-octyl-3-methylimidazolium tetrafluoroborate [ …”

Imidazole Schiff base ligands: Synthesis, coordination complexes and biological activities

“…This compound was prepared using a method similar to those previously reported [8,9]. To a solution of Apim (5.43 g, 43.4 mmol) in dry methano l (30 mL) was added salicylaldehyd e (5.30 g, 43.4 mmol) with constant stirring.…”

“…Although the synthesis of 2 has previously been documented [8,9] its X-ray crystal structure was not reported. Crystals of 2 and 3 were grown from saturated methanol solutions of both compounds.…”

Regeneration of the ionic liquid tetraoctylammonium oleate after metal extraction

“…Regeneration of these functionalized IL is mainly done by reducing the metal interaction of the functionality due to protonation or oxidation, which can also be achieved with weaker acids and/or bases. 22,[28][29][30][31][32][33] In most cases, these ILs cannot be directly reused for metal extraction.…”