- A simple study on vaporization enthalpy of taurine anion-based ionic liquid
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Room temperature ionic liquids, as a new type of environmentally friendly “green solvents”, have many well-known and unique properties, which lay the foundation for their wide application in many fields. Two target products, 1-propyl-3-methylimidazolium taurine ionic liquid and 1- butyl ?3- methylimidazolium taurine ionic liquid, were synthesized by conventional two - step synthesis method. Hydrogen and carbon NMR spectra were also used to verify the chemical structure of the target products. Isothermal thermogravimetric analysis was used to record the decreasing trend of the weight for two ionic liquids samples over time. According to Langmuir equation and Clausius-Clapeyron equation, vaporization enthalpies of two ionic liquids were obtained. For the study of thermodynamic properties, the vaporization enthalpy data of ionic liquid in a certain temperature range are very important and indispensable.
- Hong, Mei,Kong, Yuxia,Liu, Lu,Tong, Jing,Wu, Junshuang,Zhao, Yue
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- 1 - Methyl -3 - propyl imidazole taurine ionic liquid as well as preparation method and application thereof
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The invention discloses a 1-methyl-3-propyl imidazole taurine ionic liquid as well as a preparation method and application thereof. The preparation method disclosed by the invention belongs to a two-step synthesis method and comprises the following steps: firstly carrying out pretreatment and prepurification on raw materials, then transforming 1-methyl-3-propyl imidazole chlorine salt into an oxyhydrogen type intermediate by virtue of anion exchange resin, and then mixing taurine with an oxyhydrogen type substance, so that a final product is obtained. The preparation method has the advantage that the prepared product has high purity. A byproduct in a reaction process is mainly water and can be removed by means of vacuum drying. The 1-methyl-3-propyl imidazole taurine ionic liquid product can be used for absorbing gas such as CO2 and SO2.
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Paragraph 0017-0025
(2021/07/21)
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- Preparation of nanocellulose using ionic liquids: 1-propyl-3-methylimidazolium chloride and 1-ethyl-3-methylimidazolium chloride
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Cellulose nanocrystals were prepared using ionic liquids (ILs), 1-ethyl-3-methylimidazolium chloride [EMIM][Cl] and 1-propyl-3-methylimidazolium chloride [PMIM][Cl], from microcrystalline cellulose. The resultant samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The XRD results showed that nanocellulose obtained by treatment with both ILs preserved basic cellulose I structure, but crystallinity index of samples (except for Sigmacell treated with [EMIM][Cl]) was lower in comparison to the starting microcrystalline cellulose. The DLS results indicated noticeably smaller particle sizes of prepared cellulose for material treated with [PMIM][Cl] compared to cellulose samples hydrolyzed with [EMIM][Cl], which were prone to agglomeration. The obtained nanocellulose had a rod-like structure that was confirmed by electron microscopy analyses. Moreover, the results described in this paper indicate that cation type of ILs influences particle size and morphology of cellulose after treatment with ionic liquids.
- Babicka, Marta,Borysiak, S?awomir,Dwiecki, Krzysztof,Ratajczak, Izabela,Wo?niak, Magdalena
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- Europium metal-organic frameworks as recyclable and selective turn-off fluorescent sensors for aniline detection
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Seven Eu-(H)BDC compounds, [RMI][Eu2(BDC)3Cl] (R = ethyl (1), propyl (2), butyl (3), H2BDC = 1,4-benzenedicarboxylic acid), [EMI]2[Eu2(BDC)3(H2BDC)Cl2] (4), [Eu(BDC)(HCOO)] (5), [Eu(BDC)Cl(H2O)] (6) and [Eu3(BDC)4Cl(H2O)6] (7), were synthesized under ionothermal conditions. Compounds 4 and 6 behave as potential highly selective turn-off fluorescent sensors for aniline, which can be detected in mixtures of aniline with contrast organic amides or alkylbenzenes. Fluorescence quenching can be observed when compounds 4 and 6 mix with the samples containing aniline. Compounds 4 and 6 show basically unchanged emission intensities and rapid response to aniline after ten recycling tests, suggesting that the compounds have high stable recycle repeatabilities.
- Feng, Hui-Jun,Xu, Ling,Liu, Bing,Jiao, Huan
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p. 17392 - 17400
(2016/11/13)
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- Ionothermal synthesis, structures, properties of cobalt-1,4-benzenedicarboxylate metal-organic frameworks
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Eight kinds of 1-methyl-3-alkylimidazolium halide [RMI]X (R=ethyl (E), propyl (P), butyl (B) and amyl (A); MI = imidazolium; X= Cl-, I-) ionic liquids (ILs) were used as reaction media and obtained a series of 2D [RMI]2[Co3(BDC)3X2] frameworks through the ionothermal reactions of 1,4-benzenedicarboxylic acid (H2BDC) with Co(NO3)2·6H2O. The 2D [RMI]2[Co3(BDC)3X2] frameworks exhibit a same (3,6) topology network with [RMI]+ cations locating in the interlayer space. [RMI]+ cations play a template role in the structure constructions, whose influence combining with the effect of X- anions pass to the TG behaviors. The decomposition temperatures of the [RMI]2[Co3(BDC)3X2] frameworks decrease with the alkyl chains in [RMI]+ cations, and the compounds containing Cl- show higher thermal stabilities than those with I-. However, compounds 1-8 exhibit two similar broad emissions at ca. 380 and 390 nm, assigned to ILCT. The RMI+ templates and the X- anions do not exert their influence on the fluorescence.
- Zhang, Zong-Hui,Xu, Ling,Jiao, Huan
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p. 217 - 222
(2016/04/06)
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- Combination effect of ionic liquid components on the structure and properties in 1,4-benzenedicarboxylate based zinc metal-organic frameworks
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Two types of 2D [RMI]2[Zn3(BDC)3X2] (Type A) and 3D [Zn(BDC)(H2O)] (Type B) (H2BDC = 1,4-benzenedicarboxylate acid) compounds were synthesized with three kinds of 1-alkyl-3-methyl imidazolium halide ([RMI]X) ionic liquids. Type A is the primary structure model showing a (3,6) network. Type B can be obtained from [BMI]Cl, [AMI]Cl and [AMI]Br media, showing a 4,4-connected {42·84} network. The structure, TG, and fluorescence analyses demonstrate the combination effect of the RMI+ templating effect and X- controlling the structure types. The boundary between Types A and B is from [PMI]Cl, via [BMI]Br, to [AMI]I as the reaction media. The decomposition temperatures of the compounds in Type A decrease with increased RMI+, while X- anions exert the influence that compounds containing Br- supply the highest thermal stability. Similarly, with increased RMI+, or X = I-, the compounds show red shifts compared to the emissions of the ligand.
- Zhang, Zong-Hui,Liu, Bing,Xu, Ling,Jiao, Huan
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p. 17980 - 17989
(2015/10/28)
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- Synthesis, characterization and thermal properties of thiosalicylate ionic liquids
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In an attempt to produce new functionalized ionic liquids, a series of thiosalicylate ionic liquids based on imidazolium, ammonium, phosphonium, choline and pyrrolidinium cations were synthesized. The compounds were characterized by Infra Red (IR), Nuclear Magnetic Resonance (NMR) and mass spectra (ESI-MS). Their glass-transition temperatures, melting points and decomposition temperatures have been measured. Physicochemical properties of ionic liquids are influenced by alkyl chain length and nature of the cation of ionic liquids. Indian Academy of Sciences.
- Wilfred, Cecilia Devi,Mustafa, Fadwa Babiker
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p. 1511 - 1515
(2014/04/03)
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- Synthesis, structure, and physico-optical properties of manganate(II)-based ionic liquids
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Several ionic liquids (ILs) based on complex manganate(II) anions with chloro, bromo, and bis(trifluoromethanesulfonyl)amido (Tf2N) ligands have been synthesized. As counterions, n-alkyl-methylimidazolium (C nmin) cations of different chain length (alkyl = ethyl (C 2), propyl (C3), butyl (C4), hexyl (C 6)) were chosen. Except for the 1-hexyl-3-methylimidazolium ILs, all of the prepared compounds could be obtained in a crystalline state at room temperature. However, each of the compounds displayed a strong tendency to form a supercooled liquid. Generally, solidification via a glass transition took place below -40°C. Consequently, all of these compounds can be regarded as ionic liquids. Depending on the local coordination environment of Mn 2+, green (tetrahedrally coordinated Mn2+) or red (octahedrally coordinated Mn2+) luminescence emission from the 4T(G) level is observed.[1] The local coordination of the luminescent Mn2+ centre has been unequivocally established by UV/Vis as well as Raman and IR vibrational spectroscopies. Emission decay times measured at room temperature in the solid state (crystalline or powder) were generally a few ms, although, depending on the ligand, values of up to 25 ms were obtained. For the bromo compounds, the luminescence decay times proved to be almost independent of the physical state and the temperature. However, for the chloro- and bis(trifluoromethanesulfonyl)amido ILs, the emission decay times were found to be dependent on the temperature even in the solid state, indicating that the measured values are strongly influenced by nuclear motion and the vibration of the atoms. In the liquid state, the luminescence of tetrahedrally coordinated Mn2+ could only be observed when the tetrachloromanganate ILs were diluted with the respective halide ILs. However, for [C3mim][Mn(Tf2N)3], in which Mn 2+ is in an octahedral coordination environment, a weak red emission from the pure compound was found even in the liquid state at elevated temperatures.
- Pitula, Slawomir,Mudring, Anja-Verena
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experimental part
p. 3355 - 3365
(2010/06/21)
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- Influence of different branched alkyl side chains on the properties of imidazolium-based ionic liquids
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Several new branched ionic liquids were synthesized under microwave irradiation applying two different synthetic approaches. Different already known ionic liquids, both linear and branched, were added to this set of new ionic liquids to investigate the influence of the branching on the thermophysical properties to elucidate first structure-property relationships. Thermogravimetric analysis was utilized to investigate the decomposition behavior and differential scanning calorimetry was used to study the influence of the branching on the thermal behavior, e.g. the melting point, the glass transition temperature, the freezing point and the cold crystallization temperature. Moreover, the water uptake of selected ionic liquids was analyzed. The Royal Society of Chemistry 2008.
- Erdmenger, Tina,Vitz, Juergen,Wiesbrock, Frank,Schubert, Ulrich S.
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supporting information; experimental part
p. 5267 - 5273
(2010/03/24)
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- Lonization state and ion migration mechanism of room temperature molten dialkylimidazolium fluorohydrogenates
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The ionization state of room temperature molten salts, alkylimidazolium fluorohydrogenates (RMIm-(HF)2.3F: R = alkyl group, M =methyl group), was evaluated from the observed diffusion coefficient and viscosity, using the Stokes-Einstein relation. Assuming that the dissociation degree of the salt is acceptable for representation of the ionic state of the molten salts, the larger the cation size with elongation of the alkyl chain was, the higher the dissociation degree of the salt Further, we proposed that an idea of the "degree of ordering of cations and anions" was more suitable to represent the ionization state without solvent species. On the basis of this idea, the smaller the cation size of RMIm(HF)2.3F salt was, the higher the ordering of the ion, indicating formation of domain particles of aggregated ions as a unit of mobile species such as A(AX)m + and X(AX)n- for A+X- salt. It was found that highly ordered particles, with large numbers for m and n, showed a high diffusion coefficient. ? 2005 American Chemical Society.
- Saito, Yuria,Hirai, Kenichi,Matsumoto, Kazuhiko,Hagiwara, Rika,Minamizaki, Yoshihiro
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p. 2942 - 2948
(2007/10/03)
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- Continuous Flow Hydroformylation of Alkenes in Supercritical Fluid-Ionic Liquid Biphasic Systems
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A process for the hydroformylation of relatively low volatility alkenes (demonstrated for 1-dodecene) in a continuous flow system is described. The catalyst is dissolved in an ionic liquid while the substrate and gaseous reagents are transported into the reactor dissolved in supercritical CO 2, which simultaneously acts as a transport vector for aldehyde products. Decompression of the fluid mixture downstream yields products which are free of both reaction solvent and catalyst. The use of rhodium complexes of triaryl phosphites leads to ligand degradation through reaction of the ionic liquid with water and subsequent attack of the released HF on the phosphite. Sodium salts of sulfonated phosphines are insufficiently soluble in the ionic liquids to obtain acceptable rates, but replacing the sodium by a cation similar to that derived from the ionic liquid, allows good solubility and activity to be obtained. The nature of the ionic liquid is very important in achieving high rates, with 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amides giving the best activity if the alkyl chain is at least C8. Catalyst turnover frequencies as high as 500 h -1 have been observed, with the better rates at higher substrate flow rates. Rhodium leaching into the product stream can be as low as 0.012 ppm, except at low partial pressures of CO/H2, when it is significantly higher. Oxygen impurities in the CO2 feed can lead to oxidation of the phosphine giving higher rates, lower selectivities to the linear aldehyde, increased alkene isomerization and greater leaching of rhodium. However, it is found that under certain process conditions, the supercritical fluid-ionic liquid (SCF-IL) system can be operated continuously for several weeks without any visible sign of catalyst degradation. Comparisons with commercial hydroformylation processes are provided.
- Webb, Paul B.,Sellin, Murielle F.,Kunene, Thulani E.,Williamson, Sylvia,Slawin, Alexandra M. Z.,Cole-Hamilton, David J.
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p. 15577 - 15588
(2007/10/03)
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- Alkylation process
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This invention relates to a process for the alkylation of aromatics by reacting an aromatic hydrocarbon with an olefin in the presence of an ionic liquid comprising (a) a compound of the formula Rn MX3-n wherein R is a C1-C6 alkyl radical, M is aluminium or gallium, X is a halogen atom and n is 0, 1 or 2 and, (b) a hydrocarbyl substituted imidazolium halide or a hydrocarbyl substituted pyridinium halide wherein at least one of the said hydrocarbyl substituents in the imidazolium halide is an alkyl group having 1-18 carbon atoms. The process allows ready separation of reaction products from the ionic liquid and improves selectivity to alkylated products.
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