The large scale synthesis of pure imidazolium and pyrrolidinium ionic liquids

Abstract

Ionic liquids are being employed in almost all areas of chemistry and materials, yet there are inherent issues which arise if the utmost care is not taken in the preparation and purification of these materials. They are not easily synthesized and purified using the existing methods. We describe a reliable method for producing large quantities of high quality ionic liquids. Additionally, we show that imidazoliums are not 'special' due to their 'inherently fluorescent' nature, that spectroscopically clean imidazoliums are attainable, and most classes of ionic liquids do exhibit fluorescent backgrounds when extreme care is not taken during their synthesis and purification.

Distribution Equilibria of Amphoteric 8-Quinolinol between 1-Alkyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)imide and Aqueous Phases and Their Effect on Ionic Liquid Chelate Extraction Behavior of Iron(III)

“…38,39 The extraction reagent HQ was purchased from Wako Pure Chemical Industries (Osaka, Japan). Other chemicals and solvents included reagent-grade materials, which were used without further purification.…”

Study of Ether-, Alcohol-, or Cyano-Functionalized Ionic Liquids Using Inverse Gas Chromatography

“…The synthesis of 1-ethylmethylether-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C 2 OC 1 mim][Tf 2 N]) and 1-ethanol-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C 2 OHmim][Tf 2 N]) was performed similarly to that described by Baker and co-workers. [43][44][45] In both cases, the materials obtained were clear, colorless fluids with purities higher than 99.5 % in mass fraction based on thermogravimetric analysis 46 and NMR spectroscopy. NMR spectra of these ILs were measured using a Bruker Avance The solutes were purchased from Aldrich with a purity higher than 99.5 %.…”

Investigating Nanostructuring within Imidazolium Ionic Liquids: A Thermodynamic Study Using Photochromic Molecular Probes

“…21 ILs produced were stored under argon to exclude absorption of atmospheric water. Spectrometric studies were carried out using a Perkin Elmer Lambda 900 spectrometer (Foss Ireland) with Perkin Elmer PTP-1 temperature controller .…”