Experimental Measurements and Molecular Dynamics Simulations of Self-Diffusivity in Mixtures of [CCim][TfN] with Difluoromethane and Pentafluoroethane.

Thermophysical properties of hydrofluorocarbon (HFC) gas and ionic liquid (IL) mixtures have previously been shown to exhibit large deviations from ideal solution behavior. Understanding self-diffusivity can help elucidate the contributing dynamic and structural properties. H and F NMR pulsed-field gradient stimulated echo techniques were utilized to measure the self-diffusion coefficients of the ions of 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)amide ([CCim][TfN]) with either difluoromethane (HFC-32) or pentafluoroethane (HFC-125) at saturation with temperatures from 25 to 75 °C and pressures to 62 bar.

Ionic Liquids for the Separation of Fluorocarbon Refrigerant Mixtures.

This review discusses the research being performed on ionic liquids for the separation of fluorocarbon refrigerant mixtures. Fluorocarbon refrigerants, invented in 1928 by Thomas Midgley Jr., are a unique class of working fluids that are used in a variety of applications including refrigeration.

Structure and Dynamics of Hydrofluorocarbon/Ionic Liquid Mixtures: An Experimental and Molecular Dynamics Study.

The physical properties of four ionic liquids (ILs), including 1--butyl-3-methylimidazolium tetrafluoroborate ([CCim][BF]), 1--butyl-3-methylimidazolium hexafluorophosphate ([CCim][PF]), 1--butyl-3-methylimidazolium thiocyanate ([CCim][SCN]), and 1--hexyl-3-methylimidazolium chloride ([CCim][Cl]), and their mixtures with hydrofluorocarbon (HFC) gases HFC-32 (CHF), HFC-125 (CHFCF), and HFC-410A, a 50/50 wt % mixture of HFC-32 and HFC-125, were studied using molecular dynamics (MD) simulation. Experiments were conducted to measure the density, self-diffusivity, and shear viscosity of HFC/[CCim][BF] system. Extensive analyses were carried out to understand the effect of IL structure on various properties of the HFC/IL mixtures.

Are ionic liquids and liquid coordination complexes really different? - Synthesis, characterization, and catalytic activity of AlCl/base catalysts.

Lewis acid/base catalysts of AlCl3/N-methyl-2-pyrrolidone (O-NMP) and AlCl3/1-methylimidazole (N-Mim) were prepared and found to have higher catalytic activity in the Friedel-Crafts alkylation of benzene than the known super acidic ionic liquid chloroaluminate [HN222][Al2Cl7] ([HN222]+ = triethylammonium). Crystals structures were obtained for AlCl3(N-Mim), [AlCl2(O-NMP)2][AlCl4], and [Al(O-NMP)6][AlCl4]3·(C6H6)3 supporting the assignments of neutral and charged catalytic species.

Mixed metal double salt ionic liquids comprised of [HN][ZnCl] and AlCl provide tunable Lewis acid catalysts related to the ionic environment.

Two solids of differing Lewis acidities, triethylammonium tetrachlorozincate ([HN222]2[ZnCl4]) and AlCl3, have been combined across 0.1 to 0.9 mole fractions (with respect to [HN222]2[ZnCl4]), and homogeneous solid double salts or mixed metal [HN222]2x[(1 - x)AlCl3 + xZnCl4] double salt ionic liquids (DSILs) were obtained at x = 0.

Crystal structure of Zn(ZnCl)(Cho): the transformation of ions to neutral species in a deep eutectic system.

A neutral molecular complex, Zn(ZnCl)(Cho), has been isolated from the well-known choline chloride/ZnCl deep eutectic system (DES) and its crystal structure has been determined. The structure demonstrates the possibility of isolating unusual coordination complexes from DES which departs from the well-established observation of such systems being formed from large, ionic metal complexes or oligomers.

ZSM-5 zeolite nanosheets with improved catalytic activity synthesized using a new class of structure-directing agents.

A new series of multiquaternary ammonium structure-directing agents, based on 1,4-diazabicyclo[2.2.2]octane, was prepared.

Synthesis of dicationic ionic liquids and their application in the preparation of hierarchical zeolite Beta.

Piperidine- and imidazole-based dicatoinic ionic liquids have been developed for the synthesis of zeolite Beta. Hierarchical Beta has a larger surface area and pore volume than conventional Beta. Beta derived from a dicationic ionic liquid exhibited remarkably higher catalytic activity than the conventional Beta.