Ionic Liquids—Progress on the Fundamental Issues

MacFarlane, Douglas R.; Seddon, Kenneth R.

doi:10.1071/ch06478

Cited by 368 publications

(277 citation statements)

References 15 publications

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“…In this light, the operational limit for the dicationic ionic liquids ranges from 228.8°C for [2C 8 31,56 In general, our ionic liquids show a lower thermal stability with respect to dicationic pyrrolidinium and imidazolium salts having aliphatic spacers previously reported by Armstrong and co-workers. 3 The very different thermal stability could be a result of the different nature of the spacer used.…”

Section: Tga Measurementssupporting

confidence: 52%

Solution and thermal behaviour of novel dicationic imidazolium ionic liquids

et al. 2013

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A new class of functionalised dicationic ionic liquids, containing a central cationic unit capped by a basic functionality (imidazole), has been synthesised. These salts have been characterised in isotropic solution using proton and 2D-NMR spectroscopy, and their thermal stability has been studied by DSC and TGA. All these novel salts contain the 1-(1-imidazolylmethyl)-3,5-di{1-(3'-octylimidazolylmethyl)}-benzene cation as a defining structural motif. Salts of both singly and doubly charged anions were prepared and, in particular, the selected monoanions (Br − , [BF 4 ] − , or [NTf 2 ] − ) differ in size, shape and hydrogenbonding ability, whereas the dianions differ in the nature of the spacer, such as 1,4-benzenedicarboxylate, 2,6-naphthalenedicarboxylate, 1,5-and 2,6-naphthalenedisulfonate, 1,4-butanedicarboxylate, and 1,6-hexanedicarboxylate. These ionic liquids exhibit the presence of different conformers in solution, whose distribution is affected by the nature of the anion. The nature of the anion also affects their thermal stability.

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Section: Tga Measurementssupporting

confidence: 52%

Solution and thermal behaviour of novel dicationic imidazolium ionic liquids

et al. 2013

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“…17 Hence, they are being actively investigated as alternative solvent media in synthesis, 18 catalysis, 19 polymerization, [20][21][22] separation, 23 electrochemistry 24,25 and electrochemical devices. 26,27 However, the basic science involved with fully characterizing these ILs is still in its infancy, and this may be holding back the complete and most efficient utilization of these potentially, and only in some cases, 28 41 dried under vacuum at 40 1C for 48 h, and stored under argon at 20 1C before analysis. Absorption spectra were recorded on a Varian Cary 100 Bio UV-Visible Spectrophotometer, this instrument is also equipped with a temperature-controlled 6 Â 6 multicell holder.…”

Section: Introductionmentioning

confidence: 99%

Photo- and solvatochromic properties of nitrobenzospiropyran in ionic liquids containing the [NTf2]− anion

Byrne

Fraser

Izgorodina

et al. 2008

Phys. Chem. Chem. Phys.

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The photo-, thermo-and solvatochromic properties of 2,3-dihydro-1 0 ,3 0 ,3 0 -trimethyl-6-nitrospiro-[1-benzopyran-2,2 0 -1H-indole] (BSP-NO 2 ) were studied in ILs containing the anion [NTf 2 ] À by UV-Vis absorption spectroscopy, ab initio molecular orbital theory and density functional theory (DFT) calculations. It was found that the kinetics and thermodynamics of the BSP-NO 2 2 MC (merocyanine) Q4 equilibrium was sensitive to the nature of the cation. It was also observed that the imidazolium cation can form a through-space orbital interaction with the MC isomer, rather than a simple electrostatic interaction, thus preventing the MC conversion back to the BSP-NO 2 isomer. The BSP-NO 2 2 MC equilibrium thus serves as a model system for studying modes of interaction of the cations in ionic liquids.

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“…Nowadays, ILs are emerging as alternative green solvents, in other words, as alternative reaction media for synthesis, catalysis, and biocatalysis, but also as electrolytes, lubricants, or modifiers of mobile and stationary phases in the separation sciences. [1][2][3][4][5][6] ILs have been used in industrial processes for more than a decade, and their applications continue to expand. For instance, extractive distillation and liquid-liquid extraction with ILs as a separating agent is a novel method for the separation of an ethanol-water mixture, 7 of thiophene from aliphatic hydrocarbons, 8 and of methanol from aliphatic hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Partition Coefficients of Organic Compounds in New Imidazolium and Tetralkylammonium Based Ionic Liquids Using Inverse Gas Chromatography

et al. 2009

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Partition coefficients of 51 organic compounds in two ionic liquids (IL), 1-ethyl-3-methylimidazolium dicyanamide and trimethylhexylammonium bis((trifluoromethyl)sulfonyl)amide, were measured using inverse gas chromatography from (322.5 to 352.5) K. These partition coefficients were converted into water-to-IL partition coefficients using the corresponding gas-to-water partition coefficients. Both sets of partition coefficients were analyzed using the Abraham solvation parameter model with cation-specific and anionspecific equation coefficients. The derived equations correlated the experimental gas-to-IL and water-to-IL partition coefficient data to within (0.12 and 0.14) log units, respectively.

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Ionic Liquids—Progress on the Fundamental Issues

Cited by 368 publications

References 15 publications

Solution and thermal behaviour of novel dicationic imidazolium ionic liquids

Solution and thermal behaviour of novel dicationic imidazolium ionic liquids

Photo- and solvatochromic properties of nitrobenzospiropyran in ionic liquids containing the [NTf2]− anion

Partition Coefficients of Organic Compounds in New Imidazolium and Tetralkylammonium Based Ionic Liquids Using Inverse Gas Chromatography

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