Cited by 177
The dissolution and separation of rare earth oxides were realized by novel Brønsted acidic deep eutectic solvents.
Shanghai Polytechnic University
Publishes on Crystallization and Solubility Studies, X-ray Diffraction in Crystallography, Ionic liquids properties and applications. 25 papers and 317 citations.
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The dissolution and separation of rare earth oxides were realized by novel Brønsted acidic deep eutectic solvents.
Abstract Among the various thermochromic materials, liquid thermochromic materials are comparatively rare. To produce functional thermochromic liquids, we have designed ionic liquids based on cationic nickel complexes with ether side chains, [Ni(acac)(Me 2 NC 2 H 4 NR 1 R 2 )]Tf 2 N ([ 1 ]Tf 2 N: R 1 =C 3 H 6 OEt, R 2 =Me; [ 2 ]Tf 2 N: R 1 =C 3 H 6 OMe, R 2 =Me; [ 3 ]Tf 2 N: R 1 =R 2 =C 3 H 6 OMe), where acac=acetylacetonate and Tf 2 N=(F 3 CSO 2 ) 2 N − . The side chains (R 1 , R 2 ) can moderately coordinate to the metal center, enabling temperature‐dependent coordination equilibria in the liquid state. [ 1 ]Tf 2 N is a liquid at room temperature. [ 2 ]Tf 2 N is obtained as a solid ( T m =352.7 K) but remains liquid at room temperature after melting. [ 3 ]Tf 2 N is a solid with a high melting point ( T m =422.3 K). These salts display thermochromism in the liquid state, appearing red at high temperatures and orange, light‐blue, or bluish‐green at lower temperatures, and exhibiting concomitant changes in their magnetic properties. This phenomenon is based on temperature‐dependent equilibrium between a square‐planar diamagnetic species and a paramagnetic species with intramolecular ether coordination.