Room Temperature Ionic liquids are relatively more useful in the synthesis of inorganic nanostructured materials because of their unique properties. To synthesize the iron oxide nanoparticle in simple precipitation method, a novel ionic liquid was used as the greener medium and stabilizing agent namely “1-n-butyl-3-methylimidazolium trifluoromethane sulfonate [BMIM][TfO]”. The crystallinity, chemical structure, morphology and magnetic properties of the synthesized magnetite nanoparticles have been characterized by using X-ray diffraction (XRD), Fourier Transform Infrared (FT-IR), Scanning electron microscopy (SEM), Atomic force microscopy(AFM), Transmission electron microscopy (TEM) and Vibrating sample magnetometer (VSM) studies. The XRD study is divulge that the synthesized magnetite nanoparticles have inverse spinel face centered cubic structure. The FT-IR vibration peaks show the formation of Fe|sub|3|/sub|O|sub|4|/sub| nanoparticles, where the vibration peak for Fe-O is deliberately
TY - JOUR. T1 - Probing the effect of a room temperature ionic liquid on self-assembled structure of phospholipid membrane. AU - Bhattacharya, G.. AU - Gupta, R.. AU - Sen, D.. AU - Aswal, V. K.. AU - Ghosh, S. K.. PY - 2019/7. Y1 - 2019/7. M3 - Meeting Abstract. VL - 48. SP - S68-S68. JO - EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS. JF - EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS. SN - 0175-7571. ER - ...
Abstract: Supercapacitors, advanced electrochemical devices, have attracted great interest due to their extraordinary properties, such as high power density, fast charging or discharging rate, and ultra-long cycle life. Currently, great efforts have been devoted to increasing their moderate energy density (typically , 5 Wh·kg-1). Especially, room temperature ionic liquids (RTILs) have been considered as a promising electrolyte for further improving supercapacitors performances owing to their large voltage window, high thermal stability, and wide working temperature range. However, RTILs suffer from the high viscosity and poor conductivity stemming from their strong cation-anion interactions. In this work, we investigate the influences of solvent on the capacitive performance within RTIL-based supercapacitors. Activated graphene powders are employed as the electrode active materials, and 1-butyl-3-methyl-imidazolium tetrafluoroborate (BMIMBF4) is chosen as the electrolyte because of the wide ...
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Differential capacitances were measured in 1-propyl-3-methylimidazolium tetrafluoroborate (PMIBF4) ionic liquid at three different electrode substrates (Hg, GC (glassy carbon) and Au) as a function of potential. Essentially different capacitance-potential curves were obtained at different electrodes. From the parabolic electrocapillary curve measured at dropping Hg electrode in PMIBF4, the potential of zero charge (PZC) was found to be −0.31 V vs. Ag/AgCl (wire). However, the capacitance-potential curve at Hg electrode was found not to show any valley related to the PZC, whereas at GC and Au electrodes a minimum was observed at 0.29 and −0.51 V, respectively. The results are in disagreement with the recent theoretical study which implies that the capacitance-potential curve should be of bell shape with the maximum value of capacitance at PZC. The parabolic capacitance-potential curve similar to those obtained in inorganic molten salts was also observed for the first time at GC electrode. Probable
Three brønsted acidic ionic liquids, 1-methylimidazolium acetate ([Hmim][CH3COO]), 1-methylimidazolium propionate ([Hmim][CH3CH2COO]) and 1-methylimidazolium butyrate ([Hmim][CH3CH2CH2COO]) were used as reaction medium for atom transfer radical polymerization of methyl methacrylate with ethyl 2-bromoisobutyrate (EBiB)/CuBr as the initiating system. Kinetic studies, chain extension and block copolymerization confirmed the well-controlled manner of these polymerizations in three brønsted acidic ionic liquids. The reactions were fast and the polydispersities of the polymers were quite narrow (1.10,Mw/Mn,1.34). The rate of polymerization in [Hmim][RCOO] decreased with the increasing alkyl chain lengths (n from 1 to 3), indicating a strong dependence of reaction rate on the length of the substituted groups of the anions in ionic liquids. ...
The use of alkyl-3-methylimidazolium alkylsulfonate ionic liquids for implementing aqueous biphasic systems is studied in this work for the first time. The ability of high charge density inorganic salts, such as K3PO4, to promote phase segregation in aqueous solutions containing the ionic liquids 1,3-dimethylimidazolium methylsulfonate ([C(1)mim][C1SO3]), 1-ethyl-3-methylimidazolium hexylsulfonate ([C(2)mim][C6SO3]), 1-ethyl-3-methylimidazolium butylsulfonate ([C(2)mim][C4SO3]), 1-butyl-3-methylimidazolium methylsulfonate ([C(4)mim][C1SO3]), 1-butyl-3-methylimidazolium ethylsulfonate ([C(4)mim][C2SO3]), 1-pentyl-3-methylimidazolium methylsulfonate ([C(5)mim][C1SO3]), 1-hexyl-3-methylimidazolium methylsulfonate ([C(6)mim][C1SO3]) and 1-hexyl-3-methylimidazolium ethylsulfonate ([C(6)mim][C2SO3]) was experimentally determined at 298.15 K and atmospheric pressure. In general, the hydrophobicity of the ionic liquids studied is affected by the increase of the alkyl chain length. However, the position of the
Room temperature ionic liquids (RTILs) consist of bulky and asymmetric organic cations such as 1-alkyl-3-methylimidazolium, 1-alkylpyridinium, N-methyl-N-alkylpyrrolidinium and ammonium ions. Phosphonium cations are less common, but offer some advantageous properties.[23][24] A wide range of anions are employed, ranging from simple halides, which generally suffer high melting points, to inorganic anions such as tetrafluoroborate and hexafluorophosphate, and to large organic anions like bistriflimide, triflate or tosylate. There are also many potential uses of ionic liquids with simple non-halogenated organic anions such as formate, alkylsulfate, alkylphosphate or glycolate. The melting point of 1-butyl-3-methylimidazolium tetrafluoroborate is about −80 °C (−112 °F) and it is a colorless liquid with high viscosity at room temperature. If a highly asymmetric cation is combined with a highly asymmetric anion, formed ionic liquid may not freeze down to very low temperatures (down to −150 ...
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The structure and properties of the electrical double layer in ionic liquids is of interest in a wide range of areas including energy storage, catalysis, lubrication, and many more. Theories describing the electrical double layer for ionic liquids have been proposed, however a full molecular level description of the double layer is lacking. To date, studies have been predominantly focused on ion distributions normal to the surface, however the 3D nature of the electrical double layer in ionic liquids requires a full picture of the double layer structure not only normal to the surface, but also in plane. Here we utilize 3D force mapping to probe the in plane structure of an ionic liquid at a graphite interface and report the direct observation of the structure and properties of topological defects. The observation of ion layering at structural defects such as step-edges, reinforced by molecular dynamics simulations, defines the spatial resolution of the method. Observation of defects allows for ...
Room temperature ionic liquids (RTILs) are molten salts which are liquids at room temperature. Compared with traditional solvents, ionic liquids (ILs) have many advantages such as high chemical and thermal stability, low volatility and non-flammability. According to the literature, ILs have the ability to dissolve many polymers. Moreover, it is feasible to design the physicochemical properties of an IL which extend their scope. As greener solvent, IL-enzyme catalyzed relations have attracted considerable attention. Lipases are one among the important enzymes in both industrial and pharmaceutical sectors that catalyze synthesis, hydrolysis and transesterification of fatty acids esters. It has been shown that lipase is catalytically active in hydrophobic ILs with hexafluorophosphate or bis(trifluoromethanesulfonyl) imide anions while the activity is less in hydrophilic ILs with nitrate or acetate anions. Lipase is used in catalytic transesterification triglycerides with an alcohol (usually ...
Room temperature ionic liquids (RTILs) consist of bulky and asymmetric organic cations such as 1-alkyl-3-methylimidazolium, 1-alkylpyridinium, N-methyl-N-alkylpyrrolidinium and ammonium ions. Phosphonium cations are less common, but offer some advantageous properties.[23][24] A wide range of anions are employed, ranging from simple halides, which generally suffer high melting points, to inorganic anions such as tetrafluoroborate and hexafluorophosphate, and to large organic anions like bistriflimide, triflate or tosylate. There are also many potential uses of ionic liquids with simple non-halogenated organic anions such as formate, alkylsulfate, alkylphosphate or glycolate. The melting point of 1-butyl-3-methylimidazolium tetrafluoroborate is about −80 °C (−112 °F) and it is a colorless liquid with high viscosity at room temperature. If a highly asymmetric cation is combined with a highly asymmetric anion, formed ionic liquid may not freeze down to very low temperatures (down to −150 ...
TY - JOUR. T1 - Electrochemical Proton Reduction and Equilibrium Acidity (pKa) in Aprotic Ionic Liquids: Protonated Amines and Sulfonamide Acids. AU - Bentley, Cameron L. AU - Bond, Alan Maxwell. AU - Hollenkamp, Anthony Frank. AU - Mahon, Peter J. AU - Zhang, Jie. PY - 2015. Y1 - 2015. N2 - Many organic compounds contain acidic and/or basic groups that dictate their physical, chemical, and biological properties. For this reason, the acid dissociation constant, Ka, a quantitative measure of acid strength in solution, is a fundamentally important parameter in organic (synthetic) chemistry and related fields. In this study, the thermodynamics, kinetics, and mechanisms of the proton reduction (hydrogen evolution) reaction at a platinum electrode have been investigated in the room temperature ionic liquid (IL) 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, using a range of nitrogen (RxNH) acids as the proton source. The formal potential of the H+solvated/H2 process (simulated by ...
Phosphonium-based ionic liquids were used as new compatibilizers of polypropylene/polyamide blends using a standard extrusion process. Selected ionic liquids containing the same (trihexyl)tetradecylphosphonium-based cation but differing by the polarity of their counteranions were introduced at various concentrations in the blend. The anions selected have a special affinity with PP or PA6 phase (Figure 1). The effect induced by the presence of ionic liquids on the morphology, cristallization behaviour, thermal and mechanical properties of blends was highlighted. It seems that the addition of only 1wt% of ionic liquids induces a significant decrease of the size of the dispersed polymer phase (PA6 droplets) from 27 μm for the virgin binary PP/PA6 blends to 3 μm for PP/PA6/ILs ternary blends (Figure 2). It was also revealed that the final properties of the blends depend strongly on the polarity and concentration of ionic liquids introduced. When the counteranion was more hydrophilic, the compatibilization
A series of alkaline ionic liquids (ILs) including 1-butyl-3-methylimidazolium benzoate ([BMIM]PHCOO), 1-butyl-3-methylimidazolium carbonate ([BMIM]2CO3), 1-butyl-3-methylimidazolium acetate ([BMIM]OAc), 1-butyl-3-methylimidazolium hydroxide ([BMIM]OH), ethanolamine tetrafluoroborate ([MEA]BF4), and 1,1,3,3-tetramethylguanidine (TMG)-based ILs, etc., were synthesized and utilized as catalysts for the conversion of carbohydrates into 5-HMF. 1,1,3,3-tetramethylguanidine tetrafluoroborate ([TMG]BF4) was confirmed to exhibit excellent catalytic activity, and was much cheaper than other ILs such as 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) for use as a solvent in the conversion of C6 carbohydrates into 5-HMF. The 5-HMF yields from fructose, glucose, cellobiose, and microcrystalline cellulose (MCC) were 74.19%, 27.33%, 20.20%, and 17.73%, respectively. In addition, the possible pathway of carbohydrates (MCC, cellobiose, glucose, etc.) conversion into 5-HMF with [TMG]BF4 as a catalyst was speculated, and
Acknowledgements. Preface.. Editorial.. Contributors.. 1 Ionic Liquids in the Temperature Range 150-1500 K: Patterns and Problems (C.Austin Angell).. 2 Conductivities of Ionic Liquid Mixtures with Organic Electrolyte Solutions (D. Bansal, F. Croce, J. Swank and M. Salomon).. 3 How Hydrophilic Ionic Liquids Behave in Aqueous Solutions (Marijana Blesic, Kenneth R. Seddon, Natalia V. Plechkova, Nimal Gunaratne, António. Lopes and Luís Paulo N. Rebelo).. 4 Mass Spectrometry Studies on Ionic Liquids Aggregates (R. Lopes da Silva, I. M. Marrucho, J. A. P. Coutinho and Ana M. Fernandes).. 5 Study of the Sm-Al Alloys Formation in the Molten LiCl-KCl Eutectic (G. De Córdoba and C. Caravaca).. 6 Alumina Solubility and Electrical Conductivity in Potassium Cryolites with Low Cryolite Ratio (Alexander Dedyukhin, Alexei Apisarov, Olga Tkatcheva, Yurii Zaikov and Alexander Redkin).. 7 Ionic Liquids as Solvents for the Variable Temperature Electrodeposition of Metals and Semiconductors: A Short Introduction ...
Three basic ionic liquids(BILs), 1-amyl-3methylimidazolium acetate (C5mim][Ac]), 1-butyl-3methylimidazolium acetate ([Bmim][Ac]) and 1-ethyl-3-methylimidazolium acetate ([Emim][Ac]), have been applied for the dissolution of lignin from wheat grass under microwave conditions with the decreased alkalinity order of [Emim][Ac],[Bmim][Ac],[C5mim][Ac]. Also the behavior of oxygen-containing groups within lignin in the dissolution of ionic liquids was investigated by elemental analysis, analytical pyrolysis, 2D-HSQC spectra, GPC, TG and FTIR analysis. Results revealed that [Emim][Ac] showed a higher dissolution capacity (≥ 330 g/kg) at 80°C within 30 min under microwave condition with higher alkalinity. In the process of dissolution, ionic liquids mainly attack the oxygen-containing groups and the aryl ether bond in the lignin side chain. The methoxy content reduction, the cleavage of β-O-4 linkages and the degradation of β-β linkages obviously happened in the dissolution process, resulting in ...
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The chromatographic behavior of ephedrines (norephedrine, ephedrine, pseudoephedrine and methylephedrine) on a C18 column was studied with different concentrations of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquids as the eluent at pH 3.0. The addition of ionic liquid has great effects on the separation of these basic compounds: decreasing band tailing, reducing band broadening, and improving resolution. The retention times of the analytes increase at first and then decrease with the increase in the concentration of ionic liquid. This effect may be attributed to the competition between imidazolium cations and the polar groups of the analytes for the silanol group on the alkylsilica surface, and also to the formation of weak bilayer electronic structure on the C18 column. Several ionic liquids with different alkyl substituents on the imidazolium cations or with different counterions as the eluents were compared.
One of the room temperature ionic liquids (RTILs), 1-butyl-3-methylimidazoliumchloride ([BMIM]Cl) was chosen to prepare the concentrated solutions of Polyacrylonitrile(PAN). The rheological behaviors of the solutions were measured with rotational rheometryunder different conditions, including temperatures, concentration, and molecular weight ofPAN. The solutions exhibited shear-thinning behaviors, similar to that of PAN/DMFsolutions. The viscosities decreased with the increasing of shear rates. However, theviscosity decreased sharply at high shear rates when the concentration was up to 16wt%. Thedependence of the viscosity on temperature was analyzed through the determination of theapparent activation energy. Unusually, the viscosity of solutions of higher concentration islower than that of lower concentration. Similarly, the viscosity of low molecular weightPAN was higher than high molecular weight PAN at high shear rates. The dynamicrheological measurement indicates the loss modulus is much higher
Because of potential widespread application of ionic liquids in industrial processes, they should be evaluated before being allowed to enter the environment. The sorption of the substance on soil and sediment is an essential parameter in a new approach of chemical design. The HPLC method involving cyanopropyl-reversed phases for determining sorption coefficients may be an alternative tool in predicting the soil sorption properties of a variety of compounds in comparison to traditional laboratory methods. We obtain significant correlation of capacity factors, log k,and organic carbon normalized sorption coefficients, log Koc, for the set of homologous ionic liquids (1-alkyl-3-methylimidazolium salts) for meadow soils, CL1, CL2 and agricultural soils AG2, AG3 (R2=0.97, 0.97, 0.98 and 0.99, respectively). Results for marine sediment are also significant (R2=0.99). The correlation with forest soil, WO and peat, PE data is also reasonably good (R2=0.92 and R2=0.94). However, the set including both ...
The direct-on-barrier electroplating of copper on ruthenium from a 1 mol dm(-3) solution of CuCl in the ionic liquid 1-ethyl-3-methylimidazolium dicyanamide, [C(2)mim][N(CN)(2)], is reported. Continuous layers of copper with a preferential Cu(111) orientation were obtained from this electrolyte. The copper coatings were investigated by top view scanning electron microscopy (SEM), X-ray diffraction (XRD), and focused ion beam transmission electron microscopy (FIB-TEM). The nucleation density was both theoretically and experimentally evaluated by the Scharifker-Hills model and transmission electron microscopy, respectively. The direct plating of copper on resistive substrates for advanced interconnects and package is a promising new application of ionic liquids ...
Microwave heating was used to synthesise different types of 1, 2, 3 triazolium based ionic liquids (5a-j) with good yield in reduced time. These ionic liquids were further screened as reaction medium for Aldol reaction using two different most promising organocatalysts; proline and proline tetrazole. In both cases, Aldol products were obtained in good yield and selectivity with each ionic liquid. It is important to notify that all the ionic liquids (5a-j) offer 5 times recyclability with our catalytic system (Proline or Proline tetrazole ...
Aiming at designing ionic liquids for the purification of natural gas, the solubility of methane in ionic liquids is investigated here through the measurement of the solubilities of methane in four ionic liquids (ILs), in a wide range of molar fractions, temperature and pressures. With the exception of the p
Abstract: A quantitative structure-property relationship (QSPR) study on the solubility of 84 organic compounds in 4 different ionic liquids was done based on VolSurf parameters using the partial least square (PLS) statistical method and good results were obtained. The training set model predicts the solubilities of the test set well. An analysis of the VolSurf descriptors show that large volume hydrophilic regions are beneficial for solubility, and the interaction energy is about -0.84 kJ·mol-1 between the organic compounds and the ionic liquids. A certain degree of hydrophobicity is also favorable for solubility. When the ionic liquids have a small hydrophobic substituent, an asymmetric partial hydrophobic region in the organic compound is advantageous for solubility. If the ionic liquid has a large hydrophobic substituent, a large hydrophobic region in the organic compound benefits the solubility. Multiple linear regression (MLR) analysis shows that hydrophilic parameterW1 is the most ...
Ionic Liquds III will complete the trilogy of Symposium Series books Ionic Liquids: Industrial Applications for Green Chemistry, SS 818 and Ionic Liquids as Green Solvents: Progress and Prospects, SS 856 edited by Robin Rogers and Ken Seddon. Ionic Liquids III will include the latest advances in the field of ionic liquids (IL).
An ionic liquid is disclosed A precursor composition that comprises at least one ionic liquid and at least one energetic material is also disclosed, as is a method of synthesizing an ionic liquid and a method of desensitizing an explosive composition.
The negligible volatility of ionic liquids allows them to be studied by applying ultrahigh vacuum (UHV) techniques, i.e. X-ray photoelectron spectroscopy (XPS). Consequently, this Thesis describes the XPS of ionic liquid-based metal catalytic systems. Correlation between the binding energy derived from XPS and reaction performance is extensively discussed and used to design a catalytic system for the Suzuki cross coupling reaction. To allow comparable information for the solute dissolved in ionic liquids to be obtained, pure ionic liquids and ionic liquid mixtures are analysed. Fitting models of C 1 s spectra for different ionic liquid families are presented. Charge correction methods, specifically the influence of anion basicity on charge correction, are discussed in detail. The cation-anion interaction is investigated for different families of ionic liquids with single and mixed anions. The interaction between catalysts and ionic liquids can also be demonstrated by XPS. The formation of ...
TRIFLUOROMETHANESULFONYL FLUORIDE 335-05-7 NMR spectrum, TRIFLUOROMETHANESULFONYL FLUORIDE H-NMR spectral analysis, TRIFLUOROMETHANESULFONYL FLUORIDE C-NMR spectral analysis ect.
Dioxins and dioxin-like chemicals are predominantly produced by thermal processes such as incineration and combustion at concentrations in the range of 10-100 ng of I-TEQ/kg (I-TEQ = international toxic equivalents). In this work, a new approach for the removal of dioxins from high-temperature vapor streams using facilitated supported ionic liquid membranes (SILMs) is proposed. The use of ceramic membranes containing specific ionic liquids, with extremely low volatility, for dioxin removal from incineration sources is proposed owing to their stability at very high temperatures. Supported liquid membranes were prepared by successfully immobilizing the ionic liquids tri-C₈-C₁₀-alkylmethylammonium dicyanamide ([Aliquat][DCA]) and 1-n-octyl-3-methylimidazolium dicyanamide ([Omim][DCA]) inside the porous structure of ceramic membranes. The porous inorganic membranes tested were made of titanium oxide (TiO₂), with a nominal pore size of 30 nm, and aluminum oxide (Al₂O₃), with a nominal ...
Ionic liquids (ILs) with aprotic heterocyclic anions (AHA) are attractive candidates for CO2 capture technologies. In this study, a series of AHA ILs with 1-ethyl-3-methylimidazolium ([emim](+)) cations were synthesized, and their physical properties (density, viscosity, and ionic conductivity) were measured. In addition, CO2 solubility in each IL was determined at room temperature using a volumetric method at pressures between 0 and 1 bar. The AHAs are basic anions that are capable of reacting stoichiometrically with CO2 to form carbamate species. An interesting CO2 uptake isotherm behavior was observed, and this may be attributed to a parallel, equilibrium proton exchange process between the imidazolium cation and the basic AHA in the presence of CO2, followed by the formation of "transient" carbene species that react rapidly with CO2. The presence of the imidazolium-carboxylate species and carbamate anion species was verified using H-1 and C-13 NMR spectroscopy. While the reaction between CO2 ...
Cellulose was electrospun with various concentrations of ionic liquid and cosolvent. Three different cosolvents were used in this study; dimethylacetamide (DMAc), dimethyl formamide (DMF), and dimethyl sulfoxide (DMSO). The cosolvents were added to modify the viscosity, electrical conductivity, and surface tension of the solutions. The solubility of cellulose in ionic liquids is highly affected by changes in solvent properties on the molecular level in the binary solvent systems. The difference in molecular structure of the cosolvents and the interactions between cosolvent and ionic liquid can explain the difference in dissolution power of the cosolvents. Scanning electron microscope (SEM) was used to characterize electrospun cellulose fibers. For the systems tested the importance of having a rather high viscosity and high surface tension, and some degree of shear thinning to produce fibers is shown.
Three cyclic vinyl based additives, based respectively on oxygen, sulphur and fluorine, are tested for their ability to improve the cycling of lithium in a hostile ionic liquid medium. Oxygen based vinylene carbonate is found to offer the best protection of the lithium metal whilst allowing very consistent lithium cycling to occur. The vinylene carbonate based system under study is, however, imperfect. Lithium metal is deposited in a dendritic morphology, and vinylene carbonate is rapidly consumed during lithium cycling if it is present in a small quantity. Our results suggest that ionic liquid systems critically relying on a small amount of additive to protect a lithium electrode are not viable for long cycle life secondary batteries. It is suggested that an ionic liquid which itself is lithium metal compatible be used instead ...
Abstract The different solvation states of SO 2 in 1butyl3methylimidazolium thiocyanate ionic liquid were probed by the detailed analysis of the SO 2 symmetric stretching mode, s SO 2 . The band position and linewidth were monitored in function of gas molar fraction, excitation wavelength, and temperature. As expected, the decreasing of the SO 2...
We report high-resolution measurements of the forces between two atomically smooth solid surfaces across a film of 1-ethyl-3-methylimidazolium ethylsulfate ionic liquid, for film thickness down to a single ion diameter. For films thinner than ∼2 nm oscillatory structural forces are observed as the surface se
Lanzhou Greenchem ILs (OR Center for Greenchemistry and Catalysis) LICP, CAS. Provide you with Ionic Liquids and related services. According to cation, common ionic liquids including: Imidazolium, Pyrilidinium, Ammonium, Phosphonium, Pyrrolidinium, Piperidinium. Functionized ionic liquids including: hydroxyl, carboxyl, ether, ester, amido, sulfoacide, vinyl, benzyl, nitrile and guanidine.
Sigle-subsitituted imidazolium ionic liquids, which are widely used in solvent, catalysis, electrochemistry, separation, field additives, functional materials, etc.. Cations are: 1-alkyl-3-methylimidazolium and the like. wherein alkyl: methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, decyl, dodecyl, tetradecyl, cetyldecyl, hexadecyl, octodecyl and the like;Anions include: chloride, bromide, iodide, tetrafluoroborate, hexafluorophosphate, acetate, bis((trifluoromethyl)sulfonyl)imide, nitrate, perchlorate, hydrogen sulfate, dihydrogen phosphate, trifluoromethanesulfonate, trifluoroacetate, p-toluene sulfonate and the like.
The viscosity of selected families of ionic liquids has been assessed at the molecular level as a function of the intermolecular interactions using Density Functional Theory together with Atoms-in-a-Molecule and Natural Bond Orbitals approaches. Large ion clusters were studied, with the energetics and topology of interactions being related with experimental viscosity data to infer nanoscopic mechanisms controlling the viscous behavior. The reported results exhibit important information on the molecular basis controlling viscosity, which would allow advancing in the development of low-viscous ionic liquids, through a judicious selection of ion pairs considering their interactions and molecular structure ...
The interactions between three small molecules, water (H2O) , sulfur dioxide (SO2) and acetone ( (CH3)2CO ) with the ionic liquid (IL) 1-octyl-3-methylimidazolium tetrafluoroborate, [OMIM][BF4], have been determined using line of sight temperature programmed desorption (LOSTPD) from a gold surface. Multilayers of the IL were deposited by physical vapour deposition with multilayers of the small molecular species (adsorbed from the gas phase) at 90 K. LOSTPD was then carried out with the small molecular species desorbing first from the mixed multilayer, followed at higher temperatures by desorption of the IL from the gold surface. The IL had a high activation energy for desorption of 126(6) kJ mol-1 . Pure acetone showed a desorption activation energy of 38(2) kJ mol-1, which increased to 45 - 61 kJ mol-1 when it was pre-adsorbed below an overlying porous layer of the ionic liquid at 90 K. The stabilised acetone is thought to be associated with pores containing ionic moieties. Destabilised acetone ...
Ionic liquid extractants Ionic liquids are coming into their own as extractants for a range of compounds due to their high thermal stability, very low volatility and green characteristics. These properties are a direct result of their composition, typically cations based on imidazolium or phosphonium salts and anions such as BF 4 _ and PF 6 _ . A...
W. Zhao, F. Leroy, B. Heggen, S. Zahn, B. Kirchner, S. Balasubramanian and F. Muller-Plathe, Are there stable ion-pairs in room-temperature ionic liquids? Molecular dynamics simulations of 1-n-butyl 3-methylimidazolium hexafluorophosphate [bmim][PF6]?, Journal of the American Chemical Society 131, 15825 - 15833 (2009 ...
TY - JOUR. T1 - Enhanced reactivity of hydrophobic vitamin B12 towards the dechlorination of DDT in ionic liquid. AU - Jabbar, Md Abdul. AU - Shimakoshi, Hisashi. AU - Hisaeda, Yoshio. PY - 2007/1/1. Y1 - 2007/1/1. N2 - The electrolytic reductive dechlorination of 1,1-bis(p-chlorophenyl)-2,2,2- trichloroethane (DDT) in the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) in the presence of a cobalamin derivative afforded 1,1′-(ethylidene)bis(4-chlorobenzene) (DDO) and 1,1′-(ethenylidene)bis(4-chlorobenzene) (DDNU) with 1,1′-(2- chloroethylidene)bis(4-chlorobenzene) (DDMS); the enhanced reactivity, as well as the recyclability of the cobalamin derivative catalyst in IL, makes the present system more efficient for the development of "green" technologies.. AB - The electrolytic reductive dechlorination of 1,1-bis(p-chlorophenyl)-2,2,2- trichloroethane (DDT) in the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) in the presence of a ...
Ahmad, Shahzada and Deepa, M. and Sen, Vikram and Kazim, Samrana and Agarwal, S. K. (2011) Conduction Behavior in Ionic Liquids Assisted Electrodeposited Polypyrrole Layers. Polymer Engineering and Science , 51 (8). pp. 1513-1518. ISSN 1548-2634 Gerbaldi, C. and Nair, J. R. and Ahmad, Shahzada and Meligrana, G. and Bongiovanni, R. and Bodoardo, S. and Penazzi, N. (2010) UV-cured polymer electrolytes encompassing hydrophobic room temperature ionic liquid for lithium batteries. Journal of Power Sources, 195 (6). pp. 1706-1713. ISSN 0378-7753 Sharma, Bhupendra K. and Khare, Neeraj and Ahmad, Shahzada (2009) A ZnO/PEDOT:PSS based inorganic/organic hetrojunction. Solid State Communications, 149 (19-20). pp. 771-774. ISSN 0038-1098 Ahmad, Shahzada (2009) Erratum to: RETRACTED ARTICLE: Polymer electrolytes: characteristics and peculiarities. Ionics , 15 (3). p. 323. ISSN 1862-0760 Deewan , Akram and Ahmad, Shahzada and Sharmin, Eram and Ahmad, Sharif (2009) Silica Reinforced Organic-Inorganic Hybrid ...
HOT PCCP Communication. The self assembly of proteins into fibrils has been implicated in conditions including Alzheimers disease.. Scientists in Australia have shown that the amyloid fibrilization of the peptide Aβ16-22 - an important fragment used to model full length Aβ - is promoted in protic ionic liquids (pILs) containing phosphate or sulphate ions and suppressed in pILs contain mesylate ions.. Read the full PCCP communication at:. The impact of ionic liquids on amyloid fibrilization of Aβ16-22: tuning the rate of fibrilization using a reverse Hofmeister strategy ...
Abstract. The novel 1,3-dialkyl-1,2,3-triazolium ionic liquids [bmTr][PF6] and [bmTr][NTf2] are chemically inert under basic conditions and more suitable media for reactions involving bases than common 1,3-dialkylimidazolium ionic liquids such as [bmim][PF6]. [bmTr][PF6] and [bmTr][NTf2] were efficient reaction media for the Baylis-Hillman reaction.. ...
In this work, a TiO2 nanoparticle modified carbon ionic liquid electrode (CILE) was employed as a sensitive sensor for the investigation of the electrochemical behavior of indomethacin (IND). This nanocomposite sensor has been fabricated by incorporation of TiO2 nanoparticles and the ionic liquid 1-hexylpyridinium hexafluorophosphate (HPFP). The surface of the electrode was studied by scanning electron microscopy (SEM). Differential pulse voltammetry (DPV) was used for quantification of sub-micromolar amounts of IND. Electrochemical parameters of the electrode reaction of IND, including the electron transfer coefficient (α) and the electron-transfer number (n), were calculated by cyclic voltammetry (CV) methods. Under selected conditions, the anodic peak current was linear for the concentration of IND in the broad range of 1.0 × 10-7 to 1.0 × 10-4 M with the detection limit of 2.1× 10-8 M. Moreover, the analytical performance of the proposed method for the determination of IND content in plasma
Biocatalytic asymmetric reductions with whole cells can offer high enantioselectivity, environmentally benign processes and energy-effective operations and thus are of great interest. The application of whole cell-mediated bioreduction is often restricted if substrate and product have low water solubility and/or high toxicity to the biocatalyst. Many studies have shown that a biphasic system is often useful in this instance. Hence, we developed efficient biphasic reaction systems with biocompatible water-immiscible ionic liquids (ILs), to improve the biocatalytic anti-Prelog enantioselective reduction of acetyltrimethylsilane (ATMS) to (R)-1-trimethylsilylethanol {(R)-1-TMSE}, which is key synthon for a large number of silicon-containing drugs, using immobilized Candida parapsilosis CCTCC M203011 cells as the biocatalyst. It was found that the substrate ATMS and the product 1-TMSE exerted pronounced toxicity to immobilized Candida parapsilosis CCTCC M203011 cells. The biocompatible water-immiscible ILs
Ionic liquids (ILs), low temperature molten salts composed exclusively by ions (generally, by an asymmetric imidazolium, ammonium, phosphonium or sulfonium cation associated to a polyatomic anion) have attracted in the last ten years the interest of a growing number of researchers and scientists for their potential in both experimental and theoretical sciences. Surely, the fact that they are composed of ions alone and are still liquid at ambient conditions has been reason enough to evoke the initial interest among researchers. But, the option of fine-tuning the physico-chemical properties by an appropriate choice of cation and anion is the fact that has stimulated much of the current activity on these compounds, which are consequently defined as "designer solvents". ...
TY - JOUR. T1 - Poly(vinylimidazole-co-butyl acrylate) membranes for CO2 separation. AU - Song, Ting. AU - Deng, Jing. AU - Deng, Liyuan. AU - Bai, Lu. AU - Zhang, Xiangping. AU - Zhang, Suojiang. AU - Szabo, Peter. AU - Daugaard, Anders E.. PY - 2019. Y1 - 2019. N2 - Room temperature ionic liquids (RTILs) are known to exhibit high CO2 solubility, which makes them interesting candidates for separation and purification of mixed gas streams. Particularly, RTILs based on imidazoles have shown very promising results. However, membranes of the corresponding poly(RT-IL)s are inherently brittle, which makes them too fragile for use in freestanding membranes. Therefore, copolymers of N-vinylimidazole (VIm) and butyl acrylate (BuA) were prepared, showing reactivity ratios of rBuA = 1.91-2.02 and rVIm = 0.094-0.10. The prepared copolymers of poly(VIm-co-BuA) with a copolymer composition of 24:76 had sufficiently low Tg (−6.6 °C) and were flexible enough to be used for membrane preparation. The ...
0057]When the reaction is conducted in the presence of additional solvent, the additional solvent can be a single solvent or a mixture of two or more solvents. The additional solvent can preferably be selected from, for example, but is not limited to, aliphatic or aromatic hydrocarbons or their halogenated derivatives, polar solvents, and R--OH solvents. The aliphatic or aromatic hydrocarbons or their halogenated derivatives can preferably be selected from, for example, but are not limited to, benzene, toluene, xylene or its isomers, ethylbenzene, chlorobenzene, dichlorobenzene or its isomers. The polar solvents can preferably be selected from, for example, but are not limited to, acetone, butanone, dimethylformamide, dimethyl sulfone, dimethyl sulfoxide, 1-octyl-3-methylimidazolium tetrafluoroborate ([C8-mim]BF4), 1-butyl-3-methylimidazoliurn tetrafluoroborate ([C4-mim]BF4), 1-butyl-3-methyl-imidazolium tetrafluorophosphate ([bmim]BF4) or 1-butyl-3-methylimidazolium hexafluorophosphate ...