179075-88-8Relevant academic research and scientific papers
Determination of successive complexation constants in an ionic liquid: complexation of uo22+ with no3- in c4-mintf2n studied by uv-v is spectroscopy
George, Sylvia,Billard, Isabelle,Ouadi, Ali,Gaillard, Clotilde,Petitjean, Laetitia,Picquet, Michel,Solov'Ev, Vitaly
, p. 4276 - 4282 (2010)
The complexation of UO22+ with NO3 - has been investigated in the ionic liquid l-butyl-3- methylimidazolium bis(trifluoromethylsulfonyl)imide by UV-vis spectroscopy at T = 18.5?°C. The complexation is evidenced through the appearance of four peaks at 425, 438, 453, and 467 nm. EXAFS data indicate that the trinitrato complex, UO2(NO3)3-, is dominating the speciation for a reagent ratio of [NO3-]/[UO 2-]>3. Assuming three successive complexation steps, the conditional stability constants are calculated, the individual absorption spectra are derived, and a speciation plot is presented. ? 2010 American Chemical Society.
Experimental study on CO2 sorption capacity of the neat and porous silica supported ionic liquids and the effect of water content of flue gas
Mirzaei, Mojtaba,Badiei, Ali Reza,Mokhtarani, Babak,Sharifi, Ali
, p. 462 - 470 (2017)
In this research, absorption of CO2 in different ionic liquids (ILs) is studied. Thus four ILs were synthesized containing 1-butyl-3-methylimidazolium as the cation and nitrate [NO3]?, thiocyanate [SCN]?, dicyanamide [N(CN)2]? and hydrogen sulfate [HSO4]? as the anions, respectively. The resulting ILs were then immobilized into activated silica support in a 1/1 IL/SiO2 weight ratio via the impregnation-vaporization method. CO2 sorption behavior of both neat and silica supported ILs (ILs-SiO2) were investigated at different temperatures and flow rates under atmospheric pressure, while their desorption process were carried out under 20?mm?Hg at 70?°C. In both sorbents, the best results were obtained at 25?°C with a flow rate of 12?mL/min, where [bmim][N(CN)2] with 1.85 (wt%) or 0.42?mmol CO2 per gram of sorbent and [bmim][HSO4]-SiO2 with 2.33 (wt%) or 0.53?mmol CO2 per gram of sorbent showed the highest sorption capacities. The effect of water on CO2 absorption capacity of the neat and silica supported ILs were also studied by transmission of CO2 gas flue containing 400?ppm water. The results indicated that the mass gain was higher when wet CO2 was passed through the sorbents, opposed to passing dry CO2. Because of the existence of a weak coulombic intraction between the sorbents and CO2, desorption occurs rapidly and a readily reuse of the sorbents is therefore provided.
Stable gasoil/sunflower oil fuel microemulsions prepared by using methylimidazolium based ionic liquids as surfactant
Najjar, Reza,Zarei-Gharehbaba, Laya,Tazerout, Mohand,Patil, Sandeep R.
, (2020)
The fuel microemulsions of water in a 4:1 (v:v) blend of gasoil and sunflower oil (respectively) by using of 1-dodecyl-3-methylimidazolium nitrate ([C12mim][NO3]) and 1-butyl-3-methyl imidazolium nitrate ([Bmim][NO3]) ionic liquids as surfactant and 1-butanol as co-surfactant. Also, the performance of 50:50 wt% blend of the mentioned ionic liquids with Span 80 as surfactant was evaluated in this work. The comparison of the phase diagrams of the samples has revealed a larger single phase region for samples prepared with ionic liquids than the conventional Span 80 surfactant or their blends with Span 80. The dynamic viscosity, and density of two samples with high oily phase content was measured according to the standards showing very close values to the net diesel fuel. DLS analysis indicated a water droplets of 9 nm (up to 70%) for [Bmim][NO3], 3–6 nm (up to 64–82%) for [C12mim][NO3], and 331 nm (up to 53%) for systems prepared by Span 80. Meanwhile, a very narrow size distribution was observed for the samples prepared by ionic liquids. No phase separation has been observed for the prepared samples over 6 months on the shelf.
Structural and Conformational Analysis of 1-Butyl-3-methylimidazolium Nitrate
Gasbarre, Mallory,Johnston, Dean H.,Norris, Carolanne E.
, (2021)
The crystal structures of two polymorphic forms of 1-butyl-3-methylimidazolium nitrate are reported. The form observed at 100 K and 200 K (Ia and Ib) crystallizes in the P1 ˉ space group and contains two independent imidazolium cations and nitrate anions. At 100 K the butyl chain of one cation adopts a TT (trans–trans) conformation and the other cation adopts a G′G′ (gauche–gauche) conformation. At 200 K, the G′G′ chain is disordered with about twelve percent of the GT conformation present. A different polymorph (Form II, also crystallizing in the P1 ˉ space group with two independent ion pairs) is present at 273 K displaying significant disorder in the butyl chains with a mixture of G′T, G′G′, and GT conformers. Raman spectra were collected on samples between 100 and 350 K and show changes in band frequencies and intensities consistent with conversion between different butyl chain conformations. Hydrogen bond interactions are present between cation C–H’s and oxygen atoms of the nitrate ions, with significant lengthening observed for three of the six close contacts (and formation of one new contact) upon conversion to the higher-temperature form. The structural details revealed in this study shed light on the intermolecular forces and the conformational changes that accompany phase changes in 1-butyl-3-methylimidazolium nitrate. Graphic Abstract: X-ray diffraction and Raman spectroscopy of the ionic liquid 1-butyl-3-methylimidazolium nitrate at temperatures from 100 to 300 K showevidence of two different polymorphs and significant temperature-dependentconformational changes.[Figure not available: see fulltext.]
Ionic liquids promoted the CH oxidation of alcohols to carbonyl compounds using a new polysiloxane-supported (salen)chromium(III) catalyst
Zhou, Guojun,Zhang, Zhaorui,Feng, Xin,Dang, Bobo,Li, Xiaoyong,Sun, Yang
, p. 69 - 73 (2012)
An ion-exchangeable layered polysiloxane was first used as support for immobilizing a sulphonato-(salen)chromium(III) complex, and the resulted catalyst exhibited moderate to great reactivities in the CH oxidation of different alcohols into carbonyl compounds when aqueous hydrogen peroxide were employed as oxidant. And then three room temperature ionic liquids were loaded respectively for the purpose of recycling, and indeed the ionic liquid phases containing catalyst could be recycled effectively. At last, a novel layered structure of the supported catalyst was afforded and briefly discussed after X-ray powder diffraction analysis.
Electrochemical and spectroscopic study of vanadyl acetylacetonate–ionic liquids interactions
Guglielmero,Langroudi, Mo. Meskinfam,Khatib, M. Al,de Oliveira, M. Aysla Costa,Mecheri,De Leo,Mezzetta,Guazzelli,Giglioli,Epifanio, A. D',Pogni,Chiappe,Pomelli
, (2021/02/16)
A panel of ionic liquids has been synthesized and their effect on the vanadyl acetylacetonate solubility in acetonitrile has been firstly assessed. 1-Butyl-3-methylimidazolium acetate showed an unprecedented result, increasing the VO(acac)2 solubility in acetonitrile of more than one magnitude order (from 0.06 M to 1.1 M) opening new interesting horizons for the possible applications of this vanadium complex. The electrochemical effect of the considered ionic liquids has been subsequently investigated through cyclic voltammetry and linear sweep voltammetry with rotating disk electrode, determining diffusion coefficient and kinetic current of VO(acac)2 in the considered media. In order to achieve a deeper understanding on the examined systems, VO(acac)2 solutions in acetonitrile ILs were eventually studied through IR, UV–vis, and EPR spectroscopies, finding evidences, corroborated by DFT studies, of the formation of strong adducts between VO(acac)2 and ILs.
Redox Reaction: A New Route for the Synthesis of Water-Miscible Imidazolium Ionic Liquids
Li, Wenxiu,Dai, Shangwu,Li, Dong,Zhang, Qinqin,Fan, Hongtao,Zhang, Tao,Zhang, Zhigang
, p. 1065 - 1072 (2017/02/23)
A novel chemical redox route was developed for the preparation of water-miscible imidazolium ionic liquids (ILs). In this method, the reaction between 1-alkyl-3-methylimidazolium bromides or 3-butyl-1-phenylimidazolium bromide and the appropriate acid reactant was promoted by the redox reaction between the bromide ion and aqueous hydrogen peroxide, with hex-1-ene as both solvent and bromine scavenger. The residual bromide ion and water contents of the prepared ILs were determined by ion chromatography and the Karl-Fischer test, respectively. This method not only produces water-miscible ILs in high purity and high yield, but also simplifies the reaction conditions in comparison with previous routes.
A rare earth ion liquid and its preparation method and the ferric ion in the detection of the application of the
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Paragraph 0042-0044, (2017/08/25)
The invention relates to rare earth ion liquid as well as a preparation method and application thereof in o detection of ferric ions. According to the invention, the rare earth ion liquid [C4mim] [Dy(NO3)4] is used as a fluorescence probe, a rare earth ion liquid aqueous solution with fixed concentration is prepared to be used as standard detection liquid, and whether water contains ferric ions or not can be judged by observing whether the ionic liquid fluorescence light cancels or not under 325nm excitation wavelength. By adopting the rare earth ion liquid, the ferric ions can be exclusively recognized, interference of other heavy metal ions is avoided, the detection method is simple and fast, a detection reagent is short in synthesis period and high in yield, and when being applied to actual production, the ion liquid is an environment-friendly solvent and has a wide application prospect.
The impact of ionic liquids on the coordination of anions with solvatochromic copper complexes
Kuzmina,Hassan,Patel,Ashworth,Bakis,White,Hunt,Welton
supporting information, p. 12185 - 12200 (2017/09/25)
Solvatochromic transition metal (TM)-complexes with weakly associating counter-anions are often used to evaluate traditional neutral solvent and anion coordination ability. However, when employed in ionic liquids (IL) many of the common assumptions made are no longer reliable. This study investigates the coordinating ability of weakly coordinating IL anions in traditional solvents and within IL solvents employing a range of solvatochromic copper complexes. Complexes of the form [Cu(acac)(tmen)][X] (acac = acetylacetonate, tmen = tetramethylethylenediamine) where [X]- = [ClO4]-, Cl-, [NO3]-, [SCN]-, [OTf]-, [NTf2]- and [PF6]- have been synthesised and characterised both experimentally and computationally. ILs based on these anions and imidazolium and pyrrolidinium cations, some of which are functionalised with hydroxyl and nitrile groups, have been examined. IL-anion coordination has been investigated and compared to typical weakly coordinating anions. We have found there is potential for competition at the Cu-centre and cases of anions traditionally assigned as weakly associating that demonstrate a stronger than expected level of coordinating ability within ILs. [Cu(acac)(tmen)][PF6] is shown to contain the least coordinating anion and is established as the most sensitive probe studied here. Using this probe, the donor numbers (DNs) of ILs have been determined. Relative donor ability is further confirmed based on the UV-Vis of a neutral complex, [Cu(sacsac)2] (sacsac = dithioacetylacetone), and DNs evaluated via23Na NMR spectroscopy. We demonstrate that ILs can span a wide donor range, similar in breadth to conventional solvents.
Highly asymmetric hetero-Diels-Alder reaction using helical silica-supported Mn(III)-salen catalysts
Li, Le,Li, Yu,Pang, Di,Liu, Fei,Zheng, Aqun,Zhang, Guangbin,Sun, Yang
supporting information, p. 8096 - 8103 (2015/12/30)
Helical silica were prepared and functionalized by Mn(III)-salen complexes in order to catalyze asymmetric hetero-Diels-Alder reactions. Characterizations revealed doping of sodium lactate facilitated porosity, hydrolysis resistance and chiral configurati
