Methylation of the C2 position 1,3-dialkylimidazolium based ionic liquids disrupts predominant hydrogen-bonding interaction between cation and anion leading to unexpected changes physicochemical properties. We found viscosity 1-ethyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide [C2C1C1Im][Tf2N], for example, be about three times higher than that 1-ethyl-3-methylimidazolium [C2C1Im][Tf2N]. In order explain these macroscopic upon methylation we investigated vibrational as well...

Ten [C(8)C(1)Im](+) (1-methyl-3-octylimidazolium)-based ionic liquids with anions Cl(-), Br(-), I(-), [NO(3)](-), [BF(4)](-), [TfO](-), [PF(6)](-), [Tf(2)N](-), [Pf(2)N](-), and [FAP](-) (TfO=trifluoromethylsulfonate, Tf(2)N=bis(trifluoromethylsulfonyl)imide, Pf(2)N=bis(pentafluoroethylsulfonyl)imide, FAP=tris(pentafluoroethyl)trifluorophosphate) two [C(8)C(1)C(1)Im](+) (1,2-dimethyl-3-octylimidazolium)-based Br(-) [Tf(2)N](-) were investigated by using X-ray photoelectron spectroscopy...

Angle-resolved X-ray photoelectron spectroscopy has been used to study the influence of different types anions on surface composition ionic liquids (ILs). We have investigated nine ILs with same cation, 1-octyl-3-methylimidazolium [C8C1Im]+, but very anions. In all cases, an enrichment cation alkyl chains is found at expense polar head groups and in first molecular layer. This enhancement effect decreases increasing size anion, which means it most pronounced for smallest least largest A...

Angle resolved X-ray photoelectron spectroscopy has been used to study the surface composition of various nonfunctionalized and functionalized 1,3-dialkylimidazolium ionic liquids. For [CnC1Im][Tf2N] (where n = 2-16), an enrichment aliphatic carbon was observed for longer chains (n > or 4). Enrichment also occurs alkyl attached anion, as [C2C1Im][OcOSO3]. Oligo(ethyleneglycol)ether (PEG) functionalities in cation lead a close bulk stoichiometry thus loss chains. This effect is attributed...

A systematic study of ionic liquid surfaces by angle resolved X-ray photoelectron spectroscopy (ARXPS) is presented. By reviewing recent and presenting new results for imidazolium-based liquids (ILs), we discuss the impact chemical differences on surface composition enrichment effects. (1) For hydrophilic ethylene glycol (EG) functionalised ILs [Me(EG)MIm][Tf2N], [Et(EG)2MIm][Tf2N] [Me(EG)3MIm][Tf2N], which vary in number units (from 1 to 3), find that near-surface region excellent agreement...

Carbon dioxide (CO2) absorption by the amine-functionalized ionic liquid (IL) dihydroxyethyldimethylammonium taurinate at 310 K was studied using surface- and bulk-sensitive experimental techniques. From near-ambient pressure X-ray photoelectron spectroscopy 0.9 mbar CO2, amount of captured CO2 per mole IL in near-surface region is quantified to ~0.58 mol, with ~0.15 mol form carbamate dianions ~0.43 carbamic acid. isothermal uptake experiments combined infrared spectroscopy, found be bound...

Surfaces of ionic liquids: Angle-dependent X-ray photoelectron spectroscopy (XPS) shows that the surface composition a solution [Pt(NH3)4]Cl2 in liquid 1-ethyl-3-methylimidazolium ethyl sulfate ([EMIM][EtOSO3]) deviates considerably from bulk composition. The [Pt(NH3)4]2+ cation is enriched on at expense [EMIM] (see picture), while Cl− anion depleted to below XPS detection limit. Supporting information for this article available WWW under...

Passing it on: Since every reaction at a prochiral ion must take place in close proximity to its counterion, should be possible transfer chiral information between the ions of an ionic liquid. Indeed, hydrogenation prochiral, keto-functionalized cation was found proceed presence (R)-camphorsulfonate up 80 % ee (see scheme). Supporting for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z604406_s.pdf or from author. Please note: The publisher not...

Surface studies of ionic liquids are particularly important for all kinds multiphasic operations employing liquids, e.g. biphasic homogeneous catalysis or supported liquid phase catalysis. Using X-ray photoelectron spectroscopy (XPS), the surface composition model system 1-ethyl-3-methylimidazolium ethylsulfate [EMIM][EtOSO 3 ] was investigated. By comparing two different samples this from origins, we observed a decisive influence silicon containing impurities on and structure surface. For...

We report novel supported ionic liquid (IL) phase systems, described as "inverse" SILPs, consisting of micron size IL droplets within an envelope silica nanoparticles. These IL-in-air powders, produced by easily scalable inversion process, are stable up to 60 °C and 30 bar proposed a means confront the major drawbacks conventional SILPs for gas separation. usually formed filling channels nanoporous materials with phase. In case core space pores remains open, such exhibit lack absorption...

Thermophysical properties of the ionic liquid (IL) [EMIM][B(CN)4] (1-ethyl-3-methylimidazolium tetracyanoborate) were investigated both by conventional techniques and surface light scattering (SLS) at atmospheric pressure. The density was measured between (283.15 363.15) K with a vibrating U-tube densimeter. An Abbe refractometer used for measurement refractive index in range from to 313.15) K. Self-diffusion coefficients cation anion nuclear magnetic resonance (NMR) spectroscopy (273.15...

Abstract We demonstrate the application of in situ X‐ray photoelectron spectroscopy (XPS) to monitor organic, liquid‐phase reactions. By covalently attaching ionic head groups reacting organic molecules, their volatility can be reduced such that they withstand ultra high vacuum conditions. The applied method, which is new for investigation reactions, allows following fate all elements present reaction mixture—except hydrogen—in a quantitative and oxidation‐state‐sensitive manner one...

By using a terephthalate containing ionic liquid, new metal-organic framework, hcp UiO-66, comprising (Zr12O8(OH)14) double clusters and ligands has been synthesized. The hydrothermal synthesis of UiO-66 might help to establish frameworks for industrial scale applications.

A new environmentally friendly method to synthesize long-chain and functionalized alkylsulfate ionic liquids is reported. The two-step synthesis comprises the of a methylsulfate or ethylsulfate liquid by direct alkylation in first step. In second step, this intermediate transformed transesterification reaction, using different non-functionalized alcohols, corresponding melts. entire reaction sequence halide-free liberates methanol ethanol as only by-products. Moreover, it carried out...

Liquid organic hydrogen carrier (LOHC) systems constitute a very promising concept for future storage and logistics. The builds on the conversion of excess renewable energy to via electrolysis followed by reversible catalytic hydrogenation/dehydrogenation diesel-like molecule. For an ideal design process, insight into reaction mechanisms kinetics but also precise knowledge mass transport properties are necessary. In present study, binary diffusion coefficients in selected LOHC mixtures with...

Ionic liquids (ILs) are promising solvents for gas separation processes such as carbon dioxide (CO2) capture from flue gases. For the design of corresponding and apparatus, thermophysical properties ILs containing dissolved gases required. In present study, it is demonstrated that with a single optical setup, mutual thermal diffusivities well refractive indices can be measured quasi-simultaneously mixtures. Dynamic light scattering (DLS) bulk fluids was applied to determine mixtures...

The low-viscous tricyanomethanide ([TCM](-))-based ionic liquids (ILs) are gaining increasing interest as attractive fluids for a variety of industrial applications. thermophysical properties (density, viscosity, surface tension, electrical conductivity and self-diffusion coefficient) the 1-alkyl-3-methylimidazolium [Cnmim][TCM] (n = 2, 4 6-8) IL series were experimentally measured over temperature range from 288 to 363 K. Moreover, classical force field optimized imidazolium-based [TCM](-)...

An adaptive self-healing ionic liquid nanocomposite membrane comprising a multi-layer support structure hosting the salt [Ag]+[Tf2N]− is used for separation of olefin propylene and paraffin propane. The renders like upon complexation with propylene, resulting in facilitated transport over propane at benchmark-setting selectivity permeance levels. contacting acetylene causes to liquefy without showing evidence forming explosive silver acetylide.

In the present study, thermophysical properties of tetracyanoborate-based ionic liquids (ILs) 1-ethyl-3-methylimidazolium tetracyanoborate ([EMIM][B(CN)4]) and 1-hexyl-3-methylimidazolium ([HMIM][B(CN)4]) obtained by both experimental methods molecular dynamics (MD) simulations are presented. Conventional techniques were applied for determination refractive index, density, interfacial tension, self-diffusion coefficients [HMIM][B(CN)4] at atmospheric pressure in temperature range from 283.15...

Here we present novel CO2 sorbents based on chitosan ionogels. The powder called inverse supported ionic liquid phase (SILP) materials were prepared by dissolving in various liquids (ILs) followed encapsulation of the ionogel droplets with nanoporous fumed silica. absorption was determined at 40 °C range 200 to 5500 mbar. At 1 bar, capacities these 0.1–0.8 mol kg–1; 5 values 0.2–1.5 kg–1 reached. A comparison SILP and without dissolved applied IL indicated that presence increased efficiency...

Immobilisation of catalytically-active metal salts in ionic liquids, with extraction by supercritical carbon dioxide, affords continuous Friedel–Crafts acylation, situ-recycling the catalyst.

Abstract The platinum‐catalyzed hydrosilylation of allyl chloride with trichlorosilane was investigated in an ionic liquid‐organic biphasic reaction mode. After liquid screening and repetitive batch mode experiments, the process realized a continuous using loop reactor concept integrated separation recycling catalyst phase. could be operated for 48 h at constant activity selectivity without addition platinum indicating that leaching into product phase far below 1 ppm. Enhanced...