174899-83-3Relevant articles and documents
Understanding the behavior of mixtures of protic-aprotic and protic-protic ionic liquids: Conductivity, viscosity, diffusion coefficient and ionicity
Thawarkar, Sachin,Khupse, Nageshwar D.,Shinde, Dinesh R.,Kumar, Anil
, p. 986 - 994 (2019)
We have investigated the physicochemical properties such as electrical conductivity, viscosity and diffusion coefficient for the binary mixtures of protic ionic liquids with aprotic ionic liquids and of protic with protic ionic liquids at 298.15 K. A significant enhancement in the electrical conductivity is observed for the binary mixtures of ionic liquids, as compared to those of the constituent pure ionic liquids and varied with the composition of the mixtures. The viscosity of binary mixtures of protic with aprotic ionic liquids, 1?butyl?3?methylimidazoliumbis(trifluoromethylsulfonyl)imide [bmIm][NTf2], 1?butyl?1?methylpyrrolidiumbis(trifluoromethylsulfonyl)imide [bmPyrr][NTf2] and 1,3-dimethylimidazolium methyl sulfate, [mmIm][CH3SO4] decreases with an increase in the composition of the [HmIm][CH3COO]. On the contrary, the viscosity for binary mixtures of protic with protic ionic liquid, 1?methylpyrrolidium acetate [HmPyrr][CH3COO] and 4?methylmorpholine acetate [HmMorph][CH3COO] increases upon the addition of 1?methylimidazolium acetate [HmIm][CH3COO]. The self diffusion coefficients were determined for all the binary mixtures of ionic liquids by using Pulsed Gradient Spin Echo (PGSE) NMR method. Self diffusion coefficients of [bmIm][NTf2]-[HmIm][CH3COO], [bmPyrr][NTf2]-[HmIm][CH3COO], [mmIm][CH3SO4]-[HmIm][CH3COO] are enhanced, while those of [HmPyrr][CH3COO]-[HmIm][CH3COO] and [HmMorph][CH3COO]-[HmIm][CH3COO] decreases on addition of [HmIm][CH3COO]. This is converse in the case of viscosity. Furthermore, the above correlations were interpreted with the help of NMR spectroscopy on the basis of interactions of ions in the binary mixtures of ionic liquids. Finally, we have quantified the ionicity through the Nernst–Einstein equation and have confirmed the validity of the Walden rule for the binary mixture of ionic liquids.
Transition-state effects of ionic liquids in substitution reactions of PtII complexes
Weber, Christian F.,Puchta, Ralph,Van Eikema Hommes, Nico J. R.,Wasserscheid, Peter,Van Eldik, Rudi
, p. 6033 - 6038 (2005)
When normal is a surprise: Studies of a ligand-substitution reaction of a PtII complex (see picture; apa: 2,6-bis(aminomethyl) pyridine) in water, methanol, and the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide reveal that the ionic liquid behaves normally , that is, as any other solvent. In the ionic liquid, changes in the polarity of the transition state only play a minor role. (Chemical Equation Presented)
First observation for dynamic solvent effect in ionic liquids
Kitaoka, Satoshi,Nobuoka, Kaoru,Miura, Junji,Ohga, Yasushi,Ishikawa, Yuichi
, p. 385 - 387 (2016)
We observed pressure effects on the rate of thermal fading of colored chromene 1 photochemically generated from 2 in ionic liquids. The reaction rates were retarded with increasing pressure in [C4-mim][CS], [bzl-mim][Tf2N], and [mnp-mim][Tf2N], whereas the reaction rate increased with pressures in [C4- mim][Tf2N]. These pressure-induced retardations, so-called dynamic solvent effects, result from the slow thermal fluctuations of solvents.
The effects of an ionic liquid on unimolecular substitution processes: The importance of the extent of transition state solvation
Keaveney, Sinead T.,White, Benjamin P.,Haines, Ronald S.,Harper, Jason B.
, p. 2572 - 2580 (2016)
The reaction of bromodiphenylmethane and 3-chloropyridine, which proceeds concurrently through both unimolecular and bimolecular mechanisms, was examined in mixtures of acetonitrile and an ionic liquid. As predicted, the bimolecular rate constant (k2) gradually increased as the amount of ionic liquid in the reaction mixture increased, as a result of a minor enthalpic cost offset by a more significant entropic benefit. Addition of an ionic liquid had a substantial effect on the unimolecular rate constant (k1) of the reaction, with at least a 5-fold rate enhancement relative to acetonitrile, which was found to be due to a significant decrease in the enthalpy of activation, partially offset by the associated decrease in the entropy of activation. This is in contrast to the effects seen previously for aliphatic carbocation formation, where the entropic cost dominated reaction outcome. This change is attributed to a lessened ionic liquid-transition state interaction, as the incipient charges in the transition state were delocalized across the neighbouring π systems. By varying the mole fraction of ionic liquid in the reaction mixture the ratio between k1and k2could be altered, highlighting the potential to use ionic liquids to control which pathway a reaction proceeds through.
Extraction of uranium from aqueous solutions by using ionic liquid and supercritical carbon dioxide in conjunction
Wang, Joanna Shaofen,Sheaff, Chrystal N.,Yoon, Byunghoon,Addleman, R. Shane,Wai, Chien M.
, p. 4458 - 4463 (2009)
Uranyl ions [UO2]2+ in aqueous nitric acid can be extracted into supercritical CO2 (sc-CO2) by using an imidazolium-based ionic liquid with tri-n-butyl phosphate (TBP) as a complex-ing agent. The transfer of ura
Europium-based ionic liquids as luminescent soft materials
Tang, Sifu,Babai, Arash,Mudring, Anja-Verena
, p. 7631 - 7634 (2008)
Low melting, highly luminescent: [C3mim] [Eu(Tf 2N)4] (1), [C4mim][Eu(Tf2N) 4], and [C4mpyr]2[Eu(Tf2N) 5] are the first lanthanide ionic liquids that do not need stabilization of the liquid state by neutral coligands. They show excellent photophysical properties, such as long lifetimes of luminescence at large EuIII concentration, small line width, and high color purity (see emission spectrum of 1 and photograph of a sample under UV light).
Synthesis of CoPt nanorods in ionic liquids
Wang, Yong,Yang, Hong
, p. 5316 - 5317 (2005)
Cobalt platinum nanorods, hyperbranched nanorods, and nanoparticles were synthesized in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [BMIM][Tf2N], ionic liquid though the thermal reduction of platinum acetylacetonate, and coba
Binary Mixtures of Aprotic and Protic Ionic Liquids Demonstrate Synergistic Polarity Effect: An Unusual Observation
Thawarkar, Sachin,Khupse, Nageshwar D.,Kumar, Anil
, p. 210 - 221 (2020)
In this communication, we demonstrate the solute–solvent and solvent–solvent interactions in the binary mixtures of two aprotic ionic liquids, namely 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and 1-butyl-1-methylpyrrolidinium bis(trifl
Evaluation of ionic liquids as electrolytes for vanadium redox flow batteries
Bahadori, L.,Boyd, R.,Nockemann, P.,Shafeeyan, M. S.,Warrington, A.
, (2020)
Non-aqueous redox flow batteries (NARFBs) are promising electrochemical energy storage devices due to their wide electrochemical potential windows, generally >2 V of organic solvents. This study aims to investigate the suitability of ionic liquids (ILs) as electrolytes for NARFBs containing a vanadium metal complex. The electrochemistry of a single-component NARFBs employing vanadium (III) acetylacetonate (V(acac)3) was studied in 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C4mim][NTF2], and 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide, [C4mpyr][NTF2], electrolytes. The electrochemical kinetics of the anodic and cathodic reactions was measured using cyclic voltammetry. The VII/VIII and VIII/VIV couples were quasi-reversible and together yielded a cell potential of 2.2 V in both ILs. Charge/discharge characteristics show that a coulombic efficiency for cycles 1–50 ranged from 88 to 92% using a V(acac)3/[C4mpyr][NTF2] cell.
Notes on the asymmetric hydrogenation of methyl acetoacetate in neoteric solvents
Floris, Tomas,Kluson, Petr,Muldoon, Mark J.,Pelantova, Helena
, p. 279 - 287 (2010)
Asymmetric hydrogenation of methyl acetoacetate to methyl (R)-3-hydroxybutyrate by [(R)- RuCl(binap)( p-cymen)]Cl has been studied in methanol-ionic liquid and methanol- dense CO2 solvent systems. The ionic pairs triethylhexylammonium and 1-methylimidazolium with bis(trifluoromethane sulfonyl) imide and hexafluorophosphates were used. The role of ionic pairs on the kinetic parameters and (enantio)selectivity has been demonstrated. Although the CO2 expanded methanol system suffered from a reduction in both reaction rate and product selectivity, this changed in the presence of water. The high selectivity of the optimized methanol-CO 2-water-halide system was designed as a consequence of observed additive effects.