Rare earth metal-containing ionic liquids

Abstract

As an innovative tool, ionic liquids (ILs) are widely employed as an alternative, smart, reaction media (vs. traditional solvents) offering interesting technology solutions for dissolving, processing and recycling of metal-containing materials. The costly mining and refining of rare earths (RE), combined with increasing demand for high-tech and energy-related applications around the world, urgently requires effective approaches to improve the efficiency of rare earth separation and recovery. In this context, ionic liquids appear as an attractive technology solution. This review addresses the structural and coordination chemistry of ionic liquids comprising rare earth metals with the aim to add to understanding prospects of ionic liquids in the chemistry of rare earths.

Ionic Liquids – Further Progress on the Fundamental Issues

“…Our initial focus was on protic ionic liquids where in some cases unexpected lack of complete proton transfer raised significant and often ignored issues with respect to the reactivity and other properties of these materials. With researchers recently describing other ions formed by equilibrium processes, including 'solvate' ionic liquids, [2,3] hydrate ionic liquids, [4,5] and an expanded variety (beyond the archetypical [AlCl 4 ] À -based systems) of metal co-ordination cations and anions, [6] the general phenomenon has become more commonplace, though not always acknowledged.…”

A Reusable Eu3+ Complex for Naked‐Eye Discrimination of Methanol from Ethanol with a Ratiometric Fluorimetric Equilibrium in Methanol/Ethanol Mixtures

“…The final color of the solution results from a balance of different amounts of Na[Eu(FOD) 3 OPhMe 3 ] (light yellow), [P 6,6,6,14 ][Eu(FOD) 4 ], (light yellow), NaOPHMe 3 (white) and P 6,6,6,14 FOD (purple) in each of the alcohol solutions. [22][23][24] Addition of methanol favors the formation of [Eu(FOD) 3 OPhMe 3 ]in a higher extent as reflected in the decrease in the intensity of 5 D 0 → 7 F 2 is observed during the addition of methanol (see the Supporting Information) because of the gradual FODligand replacement by phenolate. In 1:1 mixture of ethanol and methanol the solution has a λ max.…”

The effect of neodymium and yttrium on benzofuran hydrodeoxygenation performance over a bulk Ni2P catalyst

“…The rare-earth metals with unfilled 4f electron shells exhibit outstanding optical, chemical, physical and electronic properties. 10 Hence, the rare-earth metals have been adopted and studied as promoters to enhance catalysts. 11 To our knowledge, the study of rare-earth metals, such as Nd and Y, to modify bulk Ni 2 P for the HDO reaction has not been reported.…”