4.5 Review

Recent advances in NMR spectroscopy of ionic liquids

Related references

Note: Only part of the references are listed.
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Polar/apolar domains' dynamics in alkylimidazolium ionic liquids unveiled by the dual receiver NMR 1H and 19F relaxation experiment

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Summary: The spin-lattice relaxation times of both cation and anion forming ionic liquid materials were simultaneously measured using the dual receiver H-1/F-19 inversion-recovery NMR method. Experimental data analysis showed that the overall dynamic behavior of ionic liquids is influenced by the length of the alkyl chain and the capability of the anion to disrupt or stabilize the apolar domain structure.

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Low Temperature Activation of Tellurium and Resource-Efficient Synthesis of AuTe2and Ag2Te in Ionic Liquids

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Summary: The low temperature syntheses of AuTe(2) and Ag2Te starting from the elements were investigated in ionic liquids, revealing [P-66614]Cl as the most promising candidate for single phase AuTe(2) synthesis at 200°C, while Ag2Te could be obtained by reducing the temperature in the flask to 60°C. Additionally, using [P-66614]Cl in dichloromethane or a planetary ball mill resulted in quantitative yield even at room temperature. Further experiments uncovered a reaction mechanism involving alkylphosphanes in [P-66614]Cl activating tellurium and forming soluble phosphane tellurides.

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Metal Assisted Synthesis of Cationic Sulfidobismuth Cubanes in Ionic Liquids

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Fast field cycling NMR relaxometry as a tool to monitor Parmigiano Reggiano cheese ripening

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Role of cationic head-group in cytotoxicity of ionic liquids: Probing changes in bilayer architecture using solid-state NMR spectroscopy

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Field-cycling NMR and DNP - A friendship with benefits

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Summary: Field-cycling relaxometry is an inherently insensitive technique due to construction compromise for a fast-switching, low-inductance magnet; Dynamic Nuclear Polarization (DNP) has the potential to enhance magnetization and provide selectivity, but requires stable radicals introduction.

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Rotational correlation times, diffusion coefficients and quadrupolar peaks of the protic ionic liquid ethylammonium nitrate by means of 1H fast field cycling NMR relaxometry

Viviane Overbeck et al.

Summary: The protic ionic liquid ethylammonium nitrate (EAN) is characterized by hydrogen bonding similar to water. Through Fast Field Cycling NMR relaxometry, rotational correlation times and translational diffusion coefficients of EAN were successfully measured and analyzed as functions of temperature and frequency. Additionally, quadrupole relaxation enhancement was observed in EAN, a phenomenon rarely seen in liquids.

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Intra- and inter-molecular interactions in choline-based ionic liquids studied by 1D and 2D NMR

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Summary: Choline acetate and choline trifluoroacetate mixed with water participate in a strong local hydrogen bond network, with no evidence of large ion clusters. Trifluoroacetate shows weaker association effects than acetate due to its higher anion acidity. Temperature dependent measurements reveal collective reorientation of cations, anions, and water molecules even at room temperature.

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Ionic Liquid Aggregation Mechanism for Nanoparticle Synthesis

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Summary: The use of silylamine reversible ionic liquids for nanoparticle synthesis allows for size control without the need for additional stabilizing agents. The mechanism of nanoparticle formation involves a switchable aggregation mechanism rather than a reverse micelle mechanism. The addition of water affects the aggregation behavior of the ionic liquid molecules but does not impact nanoparticle size during reduction.

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Chelating Additives Reversing the Lithium Migration Direction in Ionic Liquid Electrolytes

Florian Ackermann et al.

Summary: The study investigates the influence of coordinating additives on lithium ion migration in ionic liquid mixtures, showing that strongly coordinating additives can reverse lithium migration direction and increase drift of neutral molecules. This effect depends strongy on the chelating ability of the additive, with strongly coordinating additives forming chelates with the Li ion to enhance its drift velocity.

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NMR Parameters of Imidazolium Ionic Liquids as Indicators of Their State and Properties in Aqueous Solutions

A. A. Shahkhatuni et al.

Summary: The study found that the NMR chemical shifts and spin-spin coupling constants of ILs are significantly influenced by different anions, alkyl chain lengths, and water content. The addition of water can significantly alter some NMR parameters, while others remain relatively unchanged, indicating that these parameters reflect contributions from different properties of ILs.

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Confusing Ions on Purpose: How Many Parent Acid Molecules Can Be Incorporated in a Herbicidal Ionic Liquid?

Julia L. Shamshina et al.

Summary: This study aimed to expand the application range of herbicidal ionic liquids by increasing the amount of the systemic herbicide dicamba in its HILs. The research explored the influence of different salts on composition, finding that the maximum amount of HDic that can be accommodated in these formulations is a 1:4 M ratio.

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Effect of rotating magnetic field on the diffusivity of ethylammonium nitrate ionic liquid confined between micrometer-spaced glass plates

Andrei Filippov et al.

Summary: The diffusion coefficient in layers of EAN confined between glass plates placed in a strong magnetic field is affected by the rotational conditions and duration of exposure to the magnetic field. While rotation along the magnetic field axis leads to a decrease in diffusion coefficient over time, rotation perpendicular to the magnetic field axis shows no effect on the diffusion coefficient until the rotation stops. Extended exposure to a static magnetic field can cause an increase in diffusivity when the sample starts to rotate around the axis perpendicular to the magnetic field.

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Characterization of the ionic liquid obtained by chlorosulfonation of 1-methylimidazole: 1-methyl-3-sulfonic acid imidazolium chloride, 1-methylimidazolium chlorosulfate or a zwitterionic salt?

Bela Urban et al.

Summary: Numerous organic reactions catalyzed by the ionic liquid product of chlorosulfonation of 1-methylimidazole have been reported recently. Controversial assumptions on the real structure of the catalyst have emerged, but it has now been confirmed to be 1-methylimidazolium chlorosulfate. This structure was verified through X-ray crystallography and NMR spectroscopy, with experiments supporting rapid hydrolysis in the presence of water traces.

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Rapid relaxation NMR measurements to predict rate coefficients in ionic liquid mixtures. An examination of reaction outcome changes in a homologous series of ionic liquids

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