Fluorine‐Containing Ionic Liquids from <i>N</i>‐Alkylpyrrolidine and <i>N</i>‐Methylpiperidine and Fluorinated Acetylacetones: Low Melting Points and Low Viscosities

Li, Xiaoju; Zhang, Zhuo; Garg, Sonali; Twamley, Brendan; Shreeve, Jean’ne M.

doi:10.1002/ejic.200800448

Cited by 17 publications

(9 citation statements)

References 42 publications

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“…65,71 number and strength of interactions and/or coordination, 66,67,69 which is dependent on the level of delocalisation. 68 the conformational flexibility-a higher flexibility yields a lower melting point. 71 packing efficiency-less efficient packing results in a lower melting point.…”

Section: Ionic Substitution And/or Modificationmentioning

confidence: 99%

Structural analysis of low melting organic salts: perspectives on ionic liquids

Dean

Pringle

MacFarlane

2010

Phys. Chem. Chem. Phys.

125

121

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Ionic liquid-forming salts often display low melting points (a lack of crystallisation at ambient temperature and pressure) as a result of decreased lattice energies in the crystalline state. Intermolecular interactions between the anion and cation, and the conformational states of each component of the salt, are of significant interest as many of the distinctive properties ascribed to ionic liquids are determined to a large extent by these interactions. Crystallographic analysis provides a direct insight into the spatial relationship between the cations and anions and provides a basis for an enhanced understanding of the physico-chemical relationship of the ionic liquids. This perspective article examines the crystallographic studies of relevance to ionic liquid-forming organic salts as a basis for the rational design and synthesis of novel ionic liquids.

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Section: Ionic Substitution And/or Modificationmentioning

confidence: 99%

Structural analysis of low melting organic salts: perspectives on ionic liquids

Dean

Pringle

MacFarlane

2010

Phys. Chem. Chem. Phys.

125

121

View full text Add to dashboard Cite

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“…However, the synthesis of this IL is quite involved, entailing a multistep process including anion metathesis of an IL halide salt and ammonium hfca [95]. Alternatively, Gupta et al [96,97] and Li et al [98] reported a method for synthesizing PILs utilizing β-diketones and tertiary amines, entailing a simple single pot neutralization reaction. Yet, none of the ILs synthesized by this method have been applied to extraction processes.…”

Section: +mentioning

confidence: 97%

Separating Rare-Earth Elements with Ionic Liquids

Mehio

Luo

Do‐Thanh

et al. 2016

Green Chemistry and Sustainable Technology

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The rare-earth elements (REEs) are a group of 17 chemically similar metallic elements; this group consists of scandium, yttrium, and 15 lanthanides. Due to their essential role in permanent magnets, lamp phosphors, catalysts, and rechargeable batteries, the REEs have become an essential component of the global transition to a green economy. Currently, with China producing over 90 % of the global REE output and its increasingly tightening export quota, the rest of the world is confronted with the potential risk of REE shortage. As such, many countries will have to rely on recycling REEs from pre-consumer scrap, industrial residues, and REE-containing end-of-life products. Over the course of the last two decades, ionic liquids have been increasingly used to separate REEs in the recycling process. Ionic liquids (ILs) are a class of molten salts that are liquid at temperatures below 100 C. ILs are amenable to the recycling of REEs because the cation and anion components are readily tailored to a given process, and they offer numerous advantages over typical organic solvents, such as low volatility, low flammability, a broad temperature range of stability, the ability to dissolve both inorganic and organic compounds, high conductivity, and wide electrochemical windows. In this chapter, we discuss the performance of several IL-based extraction systems used to separate and recycle REEs.

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“…So the extraction mechanism and structure-activity relationships of ammonium-Bif-ILEs with REs(III) are much more complex than for traditional organic extractants. Several 1,3-diketonate extractants, including 2-thenoyltrifluoro-acetone (HTTA), 1,1,1-trifluoro-2,4-pentanedione (HTFA), and benzoyltrifluoroacetone (HBTA), are widely used for RE(III) extraction with various synergistic agents [16][17][18] owing to weak coordination between the 1,3-diketonate moiety and REs(III). The quaternary ammonium salt [A336]Cl is extensively used as a synergistic agent, often in combination with HTTA, for synergistic extraction of trivalent lanthanides [2,3], which has been found to be considerably enhanced relative to [A336]Cl salts or HTTA alone.…”

Section: Introductionmentioning

confidence: 99%

Extraction mechanism of rare earths from chloride acidic solution with ammonium-bifunctionalized ionic liquid extractants

et al. 2016

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A series of ammonium-bifunctionalized ionic liquid extractants (ammonium-Bif-ILEs) combined with a number of anions, including carboxylic acids and 1,3-diketonates, have been prepared and studied in this report. Their extraction behavior and properties toward rare earth ions (REs(III)) are systematically investigated in chloride media as a function of important parameters such as aqueous phase pH, salting-out agent concentrations, and extraction temperature. The separation performance of ammonium-Bif-ILEs toward REs(III) are systematically discussed. The results demonstrate that ammonium-Bif-ILEs have a synergistic effect between the cation and anions in separation of REs(III). The influences of different anions on separation factor () values are further studied. By comparison, ammonium-Bif-ILEs containing 1,3-diketonates have more potential applications in La(III)/RE(III) separation than those containing carboxylic acids. ammonium-bifunctional ionic liquids, separation, rare earths Citation:Yang HL, Chen J, Wang W, Cui HM, Liu WG, Liu Y. Extraction mechanism of rare earths from chloride acidic solution with ammonium-bifunctionalized ionic liquid extractants.

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Fluorine‐Containing Ionic Liquids from N‐Alkylpyrrolidine and N‐Methylpiperidine and Fluorinated Acetylacetones: Low Melting Points and Low Viscosities

Cited by 17 publications

References 42 publications

Structural analysis of low melting organic salts: perspectives on ionic liquids

Structural analysis of low melting organic salts: perspectives on ionic liquids

Separating Rare-Earth Elements with Ionic Liquids

Extraction mechanism of rare earths from chloride acidic solution with ammonium-bifunctionalized ionic liquid extractants

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