359845-21-9Relevant articles and documents
Discovery of a magnetic ionic liquid [bmim]FeCl4
Hayashi, Satoshi,Hamaguchi, Hiro-O
, p. 1590 - 1591 (2004)
A magnetic ionic liquid, which shows a strong response to magnetic field, has been discovered. We synthesized an ionic liquid by mixing 1-butyl-3-methylimidazolium chloride ([bmim]Cl) and FeCl3, in anticipation of unique magnetic properties due to the possible local ordering of the magnetic anions. The visible absorption spectroscopy has shown that this liquid contains the high spin FeCl4- as the anion. Raman spectroscopy has indicated that it contains bmim+ as the cation. It has thus been confirmed that the prepared liquid is [bmim]FeCl4. The liquid [bmim]FeCl4 responded strongly to magnetic field. The SQUID measurements have shown that it is paramagnetic having a large magnetic susceptibility of 40.6 × 10-6 emu g-1. The present discovery of a magnetic ionic liquid has opened up a new research area of the magnetism of liquids. Copyright
Selective continuous flow extractive denitrogenation of oil containing S- and N-heteroaromatics using metal-containing ionic liquids supported on monolithic silica with hierarchical porosity
Forte, Paulo,Sachse, Alexander,Maes, Michael,Galarneau, Anne,De Vos, Dirk
, p. 1045 - 1054 (2014)
The removal of heteroaromatic nitrogen and sulfur impurities from a model oil through extraction with ionic liquids (ILs) containing metal salts was performed in view of the purification of fuel feeds. Chloride and bis(trifluoromethanesulfonyl)imide salts of Cu+, Cu2+ and Fe3+ were used. The systems based on ILs and metal compounds were applied both in batch-like liquid-liquid and continuous flow liquid-solid conditions. In a first phase, liquid-liquid biphasic extraction was used to choose the most adequate IL classes; the suitable systems were immobilized on a solid support to form metal-containing supported ionic liquid phases (SILPs). In a next phase, these SILPs were applied in breakthrough experiments. A selective extraction of N-compounds was achieved with metal-containing ionic liquids, in both liquid-liquid and liquid-solid conditions. The breakthrough experiments using Cu(NTf2)2- and FeCl4 --containing [BMIM][NTf2] SILPs immobilized on hierarchically structured silica monoliths resulted in an efficient separation of all the nitrogen compounds from the other impurities in the model oil.
Post-synthetic modification of ionic liquids using ligand-exchange and redox coordination chemistry
Leroy, Michael A.,Mroz, Austin M.,Mancuso, Jenna L.,Miller, Aaron,Van Cleve, Allison,Check, Casey,Heinz, Hendrik,Hendon, Christopher H.,Brozek, Carl K.
, p. 22674 - 22685 (2020)
Ionic liquids (ILs) derive their useful properties from molecularly tunable compositions, but methods to diversify anion identities and probe ion speciation remain limited. Here, we demonstrate post-synthetic modification of perhalometallate anions to achieve ionic liquid-to-ionic liquid transformations. Rheological measurements of the metal-containing ILs indicate that minor alterations to anion coordination spheres induce considerable changes to IL viscosities. UV-vis spectra confirm the purities for most ILs, while revealing a surprising cation dependence of perchlorovanadate speciation and supramolecular structure. The intermolecular interactions studied here span a wide range from dispersion to covalent bonding, permitting their impact on IL viscosity to be decoupled and quantified. Together, synthetic strategies from coordination chemistry paired with conventional UV-vis spectroscopy provide a powerful tool for expanding IL compositions and investigating fundamental nanoscale behavior.
Lewis Acidic Ionic Liquid [Bmim]FeCl4 as a High Efficient Catalyst for Methanolysis of Poly (lactic acid)
Liu, Huiqing,Zhao, Ruiyang,Song, Xiuyan,Liu, Fusheng,Yu, Shitao,Liu, Shiwei,Ge, Xiaoping
, p. 2298 - 2305 (2017)
Abstract: Methanolysis of poly (lactic acid) (PLA) was studied using Lewis acidic ionic liquid [Bmim]FeCl4 as a catalyst and the qualitative analysis indicated that the main product was methyl lactate. Compared with ionic liquid [Bmim]Cl, FeCl3 and other traditional catalysts, the Lewis acidic ionic liquid showed much better catalytic activity in the methanolysis of PLA. Significantly, the conversion of PLA and the yield of methyl lactate were 99.3 and 94.6% respectively with low dosage of catalyst (the molar ratio of [Bmim]FeCl4 to LA unit is 0.0025:1). The lewis acidic ionic liquid [Bmim]FeCl4 could be recycled up to 6 times and FT-IR results showed that the spectrum of the reused catalyst was similar to that of the fresh one. Moreover, a possible mechanism of the methanolysis of PLA catalyzed by [Bmim]FeCl4 was proposed. The kinetics of PLA methanolysis was also investigated under the optimum conditions and the results indicated that it was a first-order kinetic reaction with activation energy of 21.28?kJ?mol?1. Graphical Abstract: The methanolysis of poly (lactic acid) (PLA) was studied using Lewis acidic ionic liquid [Bmim]FexCl3x+1 (x>1) as catalyst. The effects of reaction temperature, reaction time, ionic liquid dosage and methanol dosage on methanolysis results were examined. The reusability of ionic liquid in the methanolysis of PLA was investigated, and the results showed that it could be recycled up to 6 times with no apparent decrease in the conversion of PLA and yield of methyl lactate. The reaction mechanism and kinetics of PLA methanolysis catalyzed by [Bmim]FexCl3x+1 were also investigated. Moreover, a possible catalysis mechanism of the methanolysis of PLA was proposed. [Figure not available: see fulltext.].
Studies on thermochemical properties of ionic liquids based on transition metal
Guan,Li,Wang,Tong,Yang
, p. 507 - 510 (2008)
A brown and transparent ionic liquid (IL), [C4mim][FeCl 4], was prepared by mixing anhydrous FeCl3 with 1-butyl-3-methylimidazolium chloride ([C4mim][Cl]), with molar ratio 1/1 under stirring in a glove box filled with dry argon. The molar enthalpies of solution, Δs Hm, of [C4mim][FeCl 4], in water with various molalities were determined by a solution-reaction isoperibol calorimeter at 298.15 K. Considering the hydrolyzation of anion [FeCl4]- in dissolution process of the IL, a new method of determining the standard molar enthalpy of solution, Δs Hm 0 , was put forward on the bases of Pitzer solution theory of mixed electrolytes. The values of Δs Hm 0 and the sum of Pitzer parameters: (4βFe,Cl(0)L+4βC4 mim,CL (0)L+ΦFe,C4 mimL) and (β Fe,Cl(1)L+4βC4 mim,CL(1)L were obtained, respectively. In terms of thermodynamic cycle and the lattice energy of IL calculated by Glasser's lattice energy theory of ILs, the dissociation enthalpy of anion [FeCl4]-, ΔHdis≈5650 kJ mol-1, for the reaction: [FeCl4]-(g) →Fe3+(g)+4Cl-(g), was estimated. It is shown that large hydration enthalpies of ions have been compensated by large the dissociation enthalpy of [FeCl4]- anion, Δd Hm, in dissolution process of the IL.
The synthesis of Fe-containing ionic liquid and its catalytic performance for the dehydration of fructose
Liu, Hui,Wang, Yue,Ma, Wanxia,Wang, Hongwei,Wang, Deping,Jiang, Wei,Zhang, Ming,Zhou, Cunshan,Li, Huaming
, p. 1541 - 1549 (2017)
Four Fe-containing ionic liquids (ILs) were synthesized by coupling of conventional imidazole ionic liquids [Cxmim]Cl (x = 4, 8, 12, 16) with FeCl3 and were characterized by FT-IR, Raman, ESI-MS and TG. All of the Fe-containing ILs were applied to the conversion of fructose into 5-hydroxymethylfurfural (HMF) in 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) subsequently and the result showed that [C16mim]FeCl4 exhibited excellent catalytic performance. Then the different reaction parameters with [C16mim]FeCl4 as catalyst were studied in detail. A 92.8% yield of HMF was obtained with 0.03 g [C16mim]FeCl4 and 0.1 g fructose in 1.0050 g [Bmim]Cl at 80 °C for 40 min in fructose/[Bmim]Cl solution.
Cytotoxicity of imidazole ionic liquids in human lung carcinoma A549 cell line
Chen, Hsiu-Liang,Kao, Hui-Fang,Wang, Jiu-Yao,Wei, Guor-Tzo
, p. 763 - 769 (2014)
Due to the unique property of ionic liquids (ILs), they have become attractive media for various types of chemical processes recently. ILs have become one of the hottest areas in chemistry recently. It is necessary to have a good understanding of the toxicity and environmental impact of ILs before employing them in industry on a larger scale. To enlarge the limited knowledge regarding the potential risk posed by ILs to the environment and the public, the cytotoxicities of 21 imidazole ILs were evaluated by sensitive colorimetric assay with Cell Counting Kit-8 (CCK-8), WST-8 2-(2-methoxy-4-nitro-phenyl)-3-(4- nitrophenyl)-5-(2,4-disulfophenyl)-2H-tetrazolium monosodium salt) in human lung carcinoma A549 cell line. The data indicated that the toxicity of 1-alkyl-3-methylimidazolium entities was dominated by the side chain length, with the longer alkyl chain of the compound having a higher toxicity. Similar results were also found for the 1-vinylimidazole cation. At the same time, the toxicity of 1-alkyl-3-methylimidazolium and 1-vinylimidazole ionic liquid also depends on the associated anion species. The EC50 values are largest for tetrafluoroborate, whereas bis(trifluoromethylsulfonyl)imide results in the lowest EC50 value. The toxicity of 1-alkyl-3- methylimidazolium ionic liquid toward A549 cell line is dominated by the side chain length, with the longer alkyl chain of the compound having a higher toxicity. The toxicity of 1-alkyl-3-methylimidazolium and 1-vinylimidazole ionic liquid also depends on the associated anion species
Tunable LCST-type phase behavior of [FeCl4]--based ionic liquids in water
Pei, Yuanchao,Cao, Yuan,Huang, Yanjie,Song, Xinxin,Wang, Huiyong,Zhao, Yuling,Wang, Jianji
, p. 587 - 593 (2016)
In this work, 16 kinds of [FeCl4]--based magnetic ionic liquids (ILs) with different cation structures have been designed and synthesized, and their structures are characterized by IR and Raman spectroscopy. Then the lower critical solution temperature (LCST)-type phase behavior of these magnetic ILs in water is investigated as a function of concentration. It is shown that cation structure, alkyl chain length and molar ratio of FeCl3/chloride IL have a significant influence on the LCST of the mixtures. The phase separation temperature can be tuned efficiently by these factors. Meanwhile, the LCST-type phase separation process is also investigated by dynamic light scattering. The results support the mechanism that the hydrogen bonds of the [FeCl4]- anion with water have been gradually disrupted to form ILs aggregates with increasing temperature. In addition, the stability of the ILs in water is also examined in some details. These LCST-type phase separation systems may have potential applications in extraction and separation techniques at room temperature.
Method for preparing p-hydroxycinnamate by lignin depolymerization catalyzed with copper
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Paragraph 0027-0029, (2020/05/08)
The invention discloses a method for preparing p-hydroxycinnamate by lignin depolymerization catalyzed with copper. The method comprises the following steps: by taking lignin as a raw material, addinga copper catalyst and a solvent, performing inert gas replacement, pressurizing to 0.1-2 MPa, then heating to 135-175 DEG C, reacting for 2-6 h while stirring to achieve catalytic degradation on thelignin to obtain a chemical product taking p-hydroxycinnamate as a main product; wherein the solvent is C1-C4 fatty alcohol; the copper catalyst is copper chloride, copper sulfate or copper bromide. The method is simple in process and mild in reaction condition, the target product can be obtained with high selectivity only by 2-6 hours at the temperature of 135-175 DEG C, the yield of the target product is high, and the yield of the p-hydroxycinnamate can reach (40-100) mg/g.
