Article

From Molten Salts to Ionic Liquids: A "Nano" Journey

Laboratory of Molecular Catalysis, Institute of Chemistry, UFRGS, Porto Alegre, RS, Brazil.
Accounts of Chemical Research (Impact Factor: 22.32). 07/2011; 44(11):1223-31. DOI: 10.1021/ar2000937
Source: PubMed

ABSTRACT

Ionic liquids (ILs), a special group of classical molten salts, are widely used in various fields of science. Historically, researchers have tested ILs out of curiosity or to improve a specific property in a particular system in many areas of chemistry or materials science. However, today, ILs are far from being simple chemical curiosities and sit at the center of various green industrial innovation processes, where they play important roles in materials extraction, reactive catalytic supports, spatial devices, and biotransformations.

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    • "Owing to the outstanding properties of -CD, a novel approach is employed to synthesize magnetite nanoparticles coated with -CD functionalized with 1-methylimidazole, which forms cyclodextrin-ionic liquid complexes (-CD-IL). Ionic liquids (ILs) are a group of molten salts that result from the combination of organic cation and various anions [27]. They typically exhibit many distinctive properties as have been reported in many studies [28] [29] [30] [31]. "
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    ABSTRACT: In this study, a novel surface of modified magnetite nanoparticles Fe3O4 was coated with β-cyclodextrin-funclionalized ionic liquid (Fe3O4-β-CD-IL) via the co-precipitation method in alkaline salt medium. β-Cyclodextrin-functionalized-ionic liquid has been effectively coated onto the surface of Fe3O4 magnetite nanoparticles. The instruments used to investigate the architecture are: Fourier Transform Infrared Spectroscopy, X-ray Powder Diffraction, Electron Microscope-Energy Dispersive X-Ray Spectrometry, Transmission Electron Microscope, Field Emission Scanning Electron Microscope, Vibrating Sample Magnetometer and Brunauer–Emmett–Teller isotherm. A Vibration Sample Magnetometer analysis verified that the Fe3O4-β-CD-IL attained excellent magnetic properties. The analysis of High Resolution Transmission Electron Microscope shows that the Fe3O4-β-CD-IL produced monodisperse particles with minimal aggregation. Moreover, electrochemical studies have revealed that this new material showed outstanding ability to recognize Bisphenol A with lower electrochemical potential at 0.5 V than other comparative materials, as well as a higher detection current. Thus, this material has promising potential as a new electrode material in sensor applications.
    Full-text · Article · Sep 2015 · Applied Surface Science
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    • "Although developed as the organic solvents alternative, the ionic liquids differ from the latter by their ionic character and their structure and organization. Coulombic interactions are the dominant interactions between the ions; however, intermolecular interactions like H bonding, í µí¼‹-í µí¼‹ stacking, van der Waals interaction, and so forth help the supramolecular organization of the ILs [24] [25]. The Coulomb interactions are responsible for the ion pairs formation and for the higher order ion clusters, but the presence of a cooperative network of hydrogen bonds between them induces the structural directionality [26] [27]. "
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    ABSTRACT: An overview of the recent advances in the field of polyoxometalate, ionic liquid hybrids, is proposed with a special attention paid to their application in catalysis, more precisely biphasic and heterogeneous catalysis. Both components of the hybrids are separately outlined pointing to their useful properties and potential for catalysis, followed by the description of the hybrids preparation and synergy between components in a large range of organic transformations. And finally a vision on the future developments is proposed.
    Full-text · Article · Jan 2014
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    ABSTRACT: Esterification of aromatic acid can be promoted via HSO3-functionalized Brønsted acidic ionic liquids (ILs). Under the optimum conditions, using 1-(3-sulfonic acid) propyl-3-methylimidazolium hydrogen sulfate ([MimC3SO3H][HSO4]) and 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulfate ([MimC4SO3H][HSO4]) as dual solvent-catalysts, the conversion of esterification of aromatic acid was determined to be more than 90%, indicating that HSO3-functionalized ILs show much better catalytic ability than those of non-functionalized ionic liquids. The separation of desired product was easily performed by extraction with diethyl ether and these HSO3-functionalized ILs could be reused 7 times after vacuum drying. Our data represent an environmentally friendly method for the preparation of aromatic esters.
    Preview · Article · Sep 2013 · Chinese Science Bulletin
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