NDLI: Homogeneous liquid–liquid extraction of neodymium(III) by choline hexafluoroacetylacetonate in the ionic liquid choline bis(trifluoromethylsulfonyl)imide

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Onghena, Bieke Van Meervelt, Luc Binnemans, Koen Jacobs, Jeroen
Description	Author Affiliation: Onghena B ( KU Leuven, Department of Chemistry, Celestijnenlaan 200F, P.O. Box 2404, 3001 Leuven, Belgium. Koen.Binnemans@chem.kuleuven.be.)
Abstract	The ionic liquid choline bis(trifluoromethylsulfonyl)imide, $[Chol][Tf_{2}N],$ was used for the extraction of neodymium(III), in combination with choline hexafluoroacetylacetonate, [Chol][hfac], as the extractant. The binary mixture of $[Chol][Tf_{2}N]$ and water shows temperature-dependent phase behavior, with an upper critical solution temperature of 72 °C. A novel extraction technique, homogeneous liquid–liquid extraction (HLLE), was applied to this solvent system. HLLE is based on the use of thermomorphic solvent mixtures and has the advantage of forming a homogeneous phase during mixing. Extraction is not kinetically hindered by an interface and the extraction equilibrium is reached faster than in the case of heterogeneous mixing in conventional solvent extraction. Several extraction parameters were studied for the extraction of neodymium(III) with [Chol][hfac]: temperature, pH, extractant concentration and loading of the ionic liquid phase. A speciation study was performed to determine the stoichiometry of the extracted neodymium(III) complex and a plausible extraction mechanism is proposed. Neodymium is extracted as a tetrakis hexafluoroacetylacetonate complex with one choline cation as counter ion. The crystal structure of the extracted complex showed the presence of a coordination bond between the choline counter ion and the neodymium(III) center, resulting in a coordination number of nine. The stripping of the loaded neodymium and the influence of acid and extractant concentrations on the phase behavior of the $[Chol][Tf_{2}N]–H_{2}O$ system were investigated.
ISSN	14779226
Issue Number	30
Journal	Dalton Trans.
Volume Number	43
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2014-08-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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