359845-21-9Relevant academic research and scientific papers
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
Solutions of complex copper salts in low-transition-temperature mixture (LTTM)
Zakharov, Maxim A.,Fetisov, Gennady V.,Veligzhanin, Alexei A.,Bykov, Michael A.,Paseshnichenko, Ksenia A.,Dunaev, Sergei F.,Aslanov, Leonid A.
, p. 18576 - 18584 (2015)
The structure and properties of diethanolamine complexes of copper(ii) triflates dissolved in an excess of diethanolamine (DH2) were studied. The copper containing substance was found to be a solution of copper(ii) complex salt [Cu2+DH2(DH-)]OTf- in LTTM composition [(DH2)4H+](OTf-), where LTTM = low-transition-temperature mixture, OTf- = triflate anion. According to the EXAFS data, the coordination number of copper(ii) atoms in solution does not exceed four. Addition of even negligible amounts of acid significantly changes DH2 volatility and decomposition conditions.
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.
Mesoporous graphite nanoflakes via ionothermal carbonization of fructose and their use in dye removal
Xie, Zai-Lai,Huang, Xing,Titirici, Maria-Magdalena,Taubert, Andreas
, p. 37423 - 37430 (2014)
The large-scale green synthesis of graphene-type two-dimensional materials is still challenging. Herein, we describe the ionothermal synthesis of carbon-based composites from fructose in the iron-containing ionic liquid 1-butyl-3-methylimidazolium tetrachloridoferrate(III), [Bmim][FeCl4] serving as solvent, catalyst, and template for product formation. The resulting composites consist of oligo-layer graphite nanoflakes and iron carbide particles. The mesoporosity, strong magnetic moment, and high specific surface area of the composites make them attractive for water purification with facile magnetic separation. Moreover, Fe3C-free graphite can be obtained via acid etching, providing access to fairly large amounts of graphite material. The current approach is versatile and scalable, and thus opens the door to ionothermal synthesis towards the larger-scale synthesis of materials that are, although not made via a sustainable process, useful for water treatment such as the removal of organic molecules. the Partner Organisations 2014.
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.
[Bmim]PF6/RuCl3 · xH2O: A novel and recyclable catalytic system for the oxidative coupling of β-naphthols
Yadav, Jhillu S.,Reddy, Basi V. S.,Gayathri, Kamakolanu Uma,Prasad, Attaluri R.
, p. 1684 - 1686 (2003)
2-Naphthols readily undergo oxidative coupling in the presence of RuCl 3·xH2O in 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]PF6) ionic liquid under aerobic conditions to afford binaphthols in excellent yields with high selectivity. The β-naphthols show enhanced reactivity in ionic liquids, thereby reducing reaction times and improving the yields significantly. The recovered ionic liquid containing ruthenium catalyst can be reused in three to four successive runs with a gradual decrease in activity.
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.].
A promising ionic liquid [BMIM][FeCl4] for the extractive separation of aromatic and aliphatic hydrocarbons
Sakal, Salem A.,Lu, Ying-Zhou,Jiang, Xiao-Chuan,Shen, Chong,Li, Chun-Xi
, p. 533 - 539 (2014)
Liquid-liquid equilibria (LLE) of the following ternary systems were measured at atmospheric pressure, that is, {cyclohexane + benzene + [BMIM][FeCl4]} at T = 298.15 K and 313.15 K, {n-hexane + benzene + [BMIM][FeCl4]}, {n-heptane + toluene + [BMIM][FeCl4]} at T = 298.15 K, and {cyclohexane + benzene + [BMIM]Cl} at T = 339.15 K. The extraction performance of ionic liquid (IL) [BMIM][FeCl4] for the aromatic hydrocarbons (benzene or toluene) from their aliphatic hydrocarbons (cyclohexane, n-heptane, or n-hexane) was analyzed and compared with some imidazolium-based ILs. The results indicate that the IL [BMIM][FeCl4] shows both higher extractive selectivity and distribution factor for the systems studied herein and thus is a promising solvent for the extractive separation of aromatic and aliphatic hydrocarbons. The LLE data were well-correlated by the nonrandom two-liquid (NRTL) model of nonelectrolyte solutions with the overall average absolute relative deviation (rmsd) being about 0.0188 in terms of the mole fraction based activity.
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.
Facile synthesis of size-tunable, multilevel nanoporous Fe 3O4 microspheres for application in electromagnetic wave absorption
Qing, Xutang,Yue, Xiaoxiao,Wang, Bing,Lu, Yun
, p. 131 - 137 (2014)
Multilevel nanoporous Fe3O4 microspheres were solvothermally synthesized using a functionalized ionic liquid [BMIM][FeCl 4] as the iron source. Size of these microspheres could be easily tuned over the range of 26-411 nm by varying the volume ratio of alkali solution added. SEM, TEM and BET isotherm characterizations confirmed that Fe 3O4 microspheres were formed by the assembly of nanoparticles with several nanometers in diameter and had a multilevel pore structure, including quasi-micropores, mesopores and macropores in/on each microsphere. The electromagnetic parameters of the Fe3O4 microspheres indicated that those nanopores contributed to the increase of dielectric loss and made an effective impedance match between dielectric loss and magnetic loss, thus enhancing the electromagnetic wave absorption of Fe 3O4 microspheres. The minimum reflection loss of 80 wt% Fe3O4/epoxy resin composites showed excellent dual adsorptions at both low frequencies and high frequencies (-40.0 dB at 1.4 GHz with a sample thickness of 5.7 mm and -25.3 dB at 16.5 GHz with a sample thickness of 3 mm), which were related to the magnetic loss and dielectric loss offered by the porous Fe3O4 microspheres.
