98892-76-3Relevant academic research and scientific papers
Polymer electrolytes containing ionic liquids with acidic counteranion (DMRImH2PO4, R = ethyl, butyl and octyl)
Lalia, Boor Singh,Sekhon
, p. 294 - 300 (2006)
Ionic liquids with acidic counteranion and having composition: 2,3-dimethyl-1-alkylimidazolium dihydrogenphosphate (DMRImH2PO4, R = ethyl, butyl, octyl) have been prepared and the effect of alkyl (R) sidechain length on the conductiv
Experimental Densities and Calculated Fractional Free Volumes of Ionic Liquids with Tri- and Tetra-substituted Imidazolium Cations
Yue, Shuwen,Roveda, John D.,Mittenthal, Max S.,Shannon, Matthew S.,Bara, Jason E.
, p. 2522 - 2532 (2018/07/25)
Although it has been estimated that there are at least 1 million ionic liquids (ILs) that are accessible using commercially available starting materials, a great portion of the ILs that have been experimentally synthesized, characterized, and studied in a variety of applications are built around the relatively simple 1-n-alkyl-3-methylimidazolium ([Cnmim]) cation motif. Yet, there is no fundamental limitation or reason as to why tri- or tetra-functionalized imidazolium cations have received far less attention. Scant physical property data exist for just a few trifunctionalized imidazolium-based ILs and there is virtually no data on tetra-functionalized ILs. Thus, there are a broad experimental spaces on the "map" of ILs that are largely unexplored. We have sought to make an initial expedition into these "uncharted waters" and have synthesized imidazolium-based ILs with one more functional group(s) at the C(2), C(4), and/or C(5) positions of the imidazolium ring (as well as N(1) and N(3)). This manuscript reports the synthesis and experimental densities of these tri- and tetra-functionalized ILs as well as calculated densities and fractional free volumes from COSMOTherm. To the best of our knowledge, this is the first report of any detailed experimental measurements or computational studies relating to ILs with substitutions at the C(4) and C(5) positions.
Ionic liquid which has a low cellulose decomposition efficiency
-
Paragraph 0154; 0157; 0158; 0159, (2017/04/13)
The present invention refers to cellulose decomposition rate of low relates to ionic liquid, the present invention according to ionic liquids compatible ionic liquid and similar or its solubility with cellulose compared to as well as superior, has a remarkably decomposition rate of cellulose disintegration when they dissolve in an unique cellulose therefore, the problem that the components close to by the polyester copolymer. useful. (by machine translation)
Estimation and structural effect on physicochemical properties of alkylimidazolium-based ionic liquids with different anions
Zhang, Qingguo,Lan, Yalin,Liu, Hongwei,Zhang, Xinyuan,Zhang, Xuelei,Wei, Ying
, p. 2002 - 2012 (2016/07/06)
Ten kinds of alkylimidazolium-based aprotic ionic liquids (AILs) with hydrogen carbonate, dihydrogen phosphate, and hydrogen sulfate anions were prepared, and methods of elemental analysis, infrared spectroscopy, and proton nuclear magnetic resonance were employed to characterize the ILs, respectively. Properties such as electrical conductivity, density, dynamic viscosity, surface tension, were measured and correlated with thermodynamic and empirical equations over various temperature ranges under ambient conditions. Some significant thermodynamic parameters of the ILs were estimated. The trends of changing with temperature for the dynamic viscosity and the electrical conductivity were described by the Vogel-Fulcher-Tamman equation. The activation energies of dynamic viscosity and electrical conductivity were also calculated. Further, the structures and the energetics of the ILs ions were obtained through combining density functional theory calculations and the COSMO-RS methodology. The structural effects of ion variation on the properties of the ILs were studied.
Direct reduction of carbon dioxide to formate in high-gas-capacity ionic liquids at post-transition-metal electrodes
Watkins, John D.,Bocarsly, Andrew B.
, p. 284 - 290 (2014/03/21)
As an approach to combat the increasing emissions of carbon dioxide in the last 50 years, the sequestration of carbon dioxide gas in ionic liquids has become an attractive research area. Ionic liquids can be made that possess incredibly high molar absorption and specificity characteristics for carbon dioxide. Their high carbon dioxide solubility and specificity combined with their high inherent electrical conductivity also creates an ideal medium for the electrochemical reduction of carbon dioxide. Herein, a lesser studied ionic liquid, 1-ethyl-3-methylimidazolium trifluoroacetate, was used as both an effective carbon dioxide capture material and subsequently as an electrochemical matrix with water for the direct reduction of carbon dioxide into formate at indium, tin, and lead electrodes in good yield (ca. 3 mg hr-1 cm -2).
Study on thermodynamic properties and estimation of polarity of ionic liquids {[Cnmmim][NTf2] (n = 2, 4)}
Wei, Jie,Ma, Tianyou,Ma, Xiaoxue,Guan, Wei,Liu, Qingshan,Yang, Jiazhen
, p. 30725 - 30732 (2014/08/05)
Two bis(trifluoromethyl sulfonyl)imide ionic liquids [Cnmmim] [NTf2] (n = 2, 4) {1-alkyl-2,3-dimethyimidazolium-N,N- bis(trifluoromethyl sulfonyl)imide} were prepared and characterized by 1H NMR spectroscopy and differential scanning calorimetry (DSC). The values of their density, surface tension and refractive index were measured in the temperature range of (298.15 to 338.15 ± 0.01) K and the average contributions to the density, surface tension, and refractive index per methyl group in the alkyl chain and the addition of a methylene group in the imidazolium ring for the ILs were discussed. The dependence of volumetric properties, surface properties and molar refraction on temperature was discussed. Based on Kabo's method and Verevkin's experimental values, the molar enthalpies of vaporization, ΔHv, for [Cnmmim] [NTf2] (n = 2, 4) were estimated. As a new idea, it was put forward that ΔHv can be assumed to consist of two parts: a part corresponds with the induced energy, ΔHvn, and another part corresponds with orientation energy from the permanent dipole moment of the ion pair in ILs, ΔHvμ. The values of ΔHvn were calculated in terms of the Lawson-Ingham equation so that the values of ΔHvμ could be estimated. Using the values of ΔHv, ΔH vn and ΔHvμ, cohesive energy density, δ2 (δ is Hildebrand solubility parameter), the contribution of induced energy, δn2, and the contribution of orientation energy, δμ2, were obtained. If a liquid only has δn then it is a non-polar liquid and if a liquid not only has δn, but also has δμ then it is a polar liquid. Since the ion pairs in ILs have a permanent dipole moment, the ionic liquid has a certain polarity. Therefore, using δμ as the polarity scaling of ILs is very convenient because the values of δμ are very easy to calculate from the enthalpy of vaporization and refractive index data.
Alkaline stable C2-substituted imidazolium-based anion-exchange membranes
Lin, Bencai,Dong, Huilong,Li, Youyong,Si, Zhihong,Gu, Fenglou,Yan, Feng
, p. 1858 - 1867 (2013/07/28)
The alkaline stability of imidazolium salts and imidazolium-based alkaline anion-exchange membranes (AEMs) was investigated in this work. C2-substituted (with methyl, isopropyl or phenyl groups) imidazolium salts, 3-ethyl-1,2-dimethyl imidazolium bromine ([EDMIm][Br]), 3-ethyl-2-isopropyl-1- methylimidazolium bromine ([EIMIm][Br]), and 3-ethyl-1-methyl-2-phenyl- imidazolium bromine ([EMPhIm][Br]), were synthesized and characterized. The effect of the C2-substitution on the alkaline stability of imidazolium salts was investigated by 1H and 13C NMR spectroscopy. Compared with the C2-unsubstituted imidazolium salt, 3-ethyl-1-methylimidazolium bromine ([EMIm][Br]), the alkaline stability of C2-substituted imidazolium salts is significantly enhanced at elevated temperatures, probably due to the steric hindrance of the substituents, which protected the imidazolium cations against the hydroxide attack. Moreover, the higher LUMO energies may also improve the alkaline stability of imidazolium salts. The alkaline stability of C2-substituted imidazolium salts was found to be in the order [EDMIm][Br] > [EIMIm][Br] > [EMPhIm][Br]. This work provides a feasible approach for enhancing the chemical stability of C2-substituted imidazolium salts, which has potential applications for alkaline anion-exchange membranes.
Ionic liquids promote PCR amplification of DNA
Shi, Yugang,Liu, Yen-Liang,Lai, Peng-Yeh,Tseng, Ming-Chung,Tseng, Min-Jen,Li, Yudong,Chu, Yen-Ho
supporting information; experimental part, p. 5325 - 5327 (2012/06/30)
A bicyclic imidazolium ionic liquid (4d), [b-4C-im][Br], was found to be highly effective not only for promoting PCR of GC-rich DNA by minimizing non-specific amplification, but also for facilitating PCR of normal-GC DNA under mild conditions.
Solvent-free aza-Markovnikov and aza-Michael additions promoted by a catalytic amount of imidazolide basic ionic liquids
Chen, Xuewei,Li, Xuehui,Song, Hongbing,Qian, Yu,Wang, Furong
supporting information; experimental part, p. 3588 - 3591 (2011/07/29)
A family of imidazolide ionic liquids were synthesized and characterized. These ionic liquids combined the virtues of strong basicity and relatively good thermal stability. Catalytic properties of these imidazolide ionic liquids were investigated and satisfactory yield was achieved when 2.0 mol % of [Bmim]Im was used as catalyst for aza-Markovnikov addition under solvent-free condition at room temperature in one hour. Experimental results show that a hydrogen bond is not formed between [Bmim]Im/imidazole and vinyl ester, and its existence is not necessary for the [Bmim]Im catalyzed aza-Markovnikov addition either. A possible mechanism for [Bmim]Im-catalyzed aza-Markovnikov addition was proposed. The use of imidazolide ionic liquids in aza-Michael addition was investigated as well.
Separation of ethyl acetate and ethanol by room temperature ionic liquids with the tetrafluoroborate anion
Hu, Xuesheng,Li, Yingxia,Cui, Dannan,Chen, Biaohua
experimental part, p. 427 - 433 (2009/12/25)
Liquid-liquid equilibrium data are presented for mixtures of 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim]BF4) or 1-(2-hydroxyethyl)-3-methylimidazolium tetrafluoroborate ([C2OHmim] BF4) or 1-ethyl-2,3-dimethylimidazolium tetrafluoroborate ([edmim]BF4) or 1-(2-hydroxyethyl)-2,3-dimethylimidazolium tetrafluoroborate ([C2OHdmim]BF4) + ethanol + ethyl acetate at 298.15 K. The distribution ratio and selectivity values, derived from the tie line data, show that [C2OHmim]BF4 has better extraction capacity than other studied ionic liquids and that a hydroxyl group on the cation and a CH3 group at the 2-position can obviously affect the interaction between the ionic liquid and ethanol. The experimental results show that [C2OHmim]BF4 is potentially a candidate to separate ethyl acetate and ethanol by liquid-liquid extraction. The experimental tie lines were correlated with the NRTL equation.
