JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Mengyi Qin,Fei Zhong,Yu Sun,Xiaoyan Tan,Kehui Hu,Huiwen Zhang,Mengke Kong,Guowei Wang,Linghua Zhuang
Anionic surface active ionic liquid (SAIL), 1-butyl-3-ethoxycarbonylimidazolium dodecanesulfate ([Etbim][C 12 H 25 SO 4 ]) was synthesized. The dependence of micellization of dodecanesulfate-based anionic SAILs on cation substituents of anionic SAILs was analyzed using experimental and theoretical studies. Critical micelle concentration of [Etbim][C 12 H 25 SO 4 ] was 1.17 mmol/L at 298.15 K. [Etbim][C 12 H 25 SO 4 ] showed superior surface property than [Bmim][C 12 H 25 SO 4 ] with same dodecanesulfate anion. Theoretical density functional theory (DFT) calculation was used to determine the micellization tendency of anionic SAILs ([Bmim][C 12 H 25 SO 4 ] and [Etbim][C 12 H 25 SO 4 ]). CMC difference of [Etbim][C 12 H 25 SO 4 ] and [Bmim][C 12 H 25 SO 4 ] was ascribed to the electrostatic interaction (repulsion or attraction) and hydrophobic interaction of cations ([Bmim] + and [Etbim] + ), dodecanesulfate anion, anionic SAILs ([Bmim][C 12 H 25 SO 4 ] or [Etbim][C 12 H 25 SO 4 ]), and the interactions toward water molecules in aqueous solution. The hydrocarbon chain lengths of [Bmim] + and [Etbim] + reflected the different hydrophobic interaction of cations, which clarified that the important role of cation substituents on micellization of [Etbim][C 12 H 25 SO 4 ] and [Bmim][C 12 H 25 SO 4 ]. Atomic charge distribution of cations will play important role on the further hydration toward water molecules or electrostatic attraction toward [C 12 H 25 SO 4 ] − anion. Typical hydrogen bonds and charge changes of typical atoms were beneficial for electrostatic attraction and electrostatic repulsion between polar groups of SAILs. The electrostatic repulsion and electrostatic attraction between polar groups of SAILs affected the CMC values of [Bmim][C 12 H 25 SO 4 ] and [Etbim][C 12 H 25 SO 4 ]. Changes of binding energy (D 0 ) and difference of binding energy (ΔD 0 ) confirmed the tendency of [Etbim][C 12 H 25 SO 4 ] micelle formation was higher than that of [Bmim][C 12 H 25 SO 4 ].
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Long Liu,Sheng Gao,Zhiyi Jiang,Yanqiang Zhang,Dayong Gui,Suojiang Zhang
A series of amide-functionalized ionic liquids (ILs), e.g., 1-R-3-(2-amino-2-oxoethyl)-imidazolium (R = −vinyl, −methyl–butyl) cations combined with Cl–, N(CN)2–, or NTf2– anions, were synthesized and fully characterized as curing agent for diglycidyl-4,5-epoxy-cyclohexane-1,2-dicarboxylate (TDE-85). Studies of curing behaviors showed that ILs with N(CN)2– anions exhibit moderate curing conditions. As to thermosets of TDE-85 cured by these curing agents, their tensile strength (95.1–111.7 MPa) and elongation at break (2.69 to 4.20%) are significantly improved compared with the traditional curing systems of DDS/TDE-85 (DDS, 4,4′-diamino diphenyl sulphone). These thermosets also exhibit good thermal mechanical properties with the glass transition temperature (Tg) > 200 °C and thermal degradation temperature (Td) > 300 °C. The possible mechanisms of curing reactions were analyzed by using IR, and results indicated that curing reactions of TDE-85 with amide-functionalized ionic liquids may include three steps, −NH2 groups reacted with oxirane at lower temperatures, and then the anions further participated in the reaction to strengthen the cross-linking networks. This study provides informative guidelines for designing new curing agents.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2018
·
IF 2.831
Yanjie Zhang,Yingxiang Du,Tao Yu,Zijie Feng,Jiaquan Chen
In this paper, two spiral structure CILs, 1-butyl-3-methylimidazolium(T-4)-bis[(2S)-2-(hydroxy-κO)-3-methyl-butanoato-κO]borate(BMIm + BLHvB − ) and 1-butyl-3-methylimidazolium (T-4)-bis[(αS)-α-(hydroxy-κO)-4-methyl-benzeneacetato-κO]borate (BMIm + BSMB-)were applied to evaluate their potential synergistic effect with dextrin for CE enantiomeric separation. The established dextrin-based synergistic system with CILs as additives showed good separation performance towards four tested drugs, including duloxetine, ketoconazole, sulconazole and citalopram. It was also observed that significantly improved separation and selectivity for tested analytes were achieved in CILs/dextrin synergistic system compared to single dextrin system. Primary parameters, such as the concentration of CIL, dextrin concentration, buffer pH and applied voltage, were systematically investigated to optimize the enantiomeric separation with BMIm + BLHvB − /dextrin as model system. Finally, the method of Statistical Product and Service Solutions (SPSS) was exploited to further elucidate the influence of experimental parameters on the synergistic effect.
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JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Changzeng Wu,Jianji Wang,Zhiyong Li,Jun Jing,Huiyong Wang
In this work, glycine ionic liquids tetramethylammonium glycine ([N 1111 ][Gly]), tetraethylammonium glycine ([N 2222 ][Gly]), tetra-n-butylammonium glycine ([N 4444 ][Gly]), tetra-n-butylphosphonium glycine ([P 4444 ][Gly]) and tetra-n-pentylammonium glycine ([N 5555 ][Gly]) were synthesized and used to prepare aqueous two-phase systems (ATPSs) in the presence of K 2 HPO 4 . Binodal curves of such ATPSs and partition coefficients of a series of dinitrophenylated (DNP) amino acids in these ATPSs were determined at 298.15 K to understand the effect of cationic structure of the ionic liquids on the phase-forming ability of glycine ionic liquids, relative hydrophobicity between the phases in the ionic liquids ATPSs, and polarity of the ionic liquids-rich phases. With the attempt to correlate the relative hydrophobicity of the phases in the ATPSs with their extraction capability for proteins, partition coefficients of cytochrome-c in the ATPSs were also determined. It was shown that partition coefficients of cytochrome-c were in the range from 2.83 to 20.7 under the studied pH conditions. Then, hydrophobic interactions between cytochrome-c and the ionic liquid are suggested to be the main driving force for the preferential partition of cytochrome-c in the glycine ionic liquid-rich phases of the ATPSs. Result derived from polarity of the ionic liquids-rich phases supports this mechanism.
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Energetic Materials Frontiers
·
2021
·
IF 0
Yang Liu,Yang Guo,Li-han Fei,Zhao-ming Mai,Cheng-long Tang,Zhi Wang,Ying-tao Wu,Zuo-hua Huang
Ionic liquids have a wide engineering application foresight due to their easy and safe storage and handling while are limited by the unclear mechanism of hypergolic ignition. In this study, three dicyanamide-based ionic liquids with different cations, 1-allyl-3-methyl imidazolium ([AMIm]), 1-ethyl-3-methylimidazolium ([EMIm]) and 1-butyl-3-methyl-imidazolium ([BMIm]), are prepared to react with white fuming nitric acid through drop tests. The diameter of ionic droplet is 2.2 mm, the impact velocities are controlled at 0.16/0.45/0.62/0.82/1.01 m s -1 by adjusting the dropping height, and the whole reacting process is recorded by three cameras to provide macroscopic, microscopic and infrared details. The promotion effect of impact velocity on hypergolic ignition probability is confirmed for all the ionic liquids, and the minimum impact velocity for successful hypergolic ignition of each ionic liquid was determined. The temperature evolution of hypergolic process shows a non-monotonic trend, and a four-stage process was performed to reveal the hypergolic mechanism. The experimental results indicate that short-chain alkyl and unsaturated substituents in cations are favored for hypergolic ignition, and the datasets are conducive for kinetic model construction.
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ANALYTICAL SCIENCES
·
2022
·Vol. 38
·期 10
·1277-1287
·
IF 1.967
Liu Cuicui,Zhao Buyi,Liu Xiaobing,Zhang Ailin
A novel capillary electrochromatography method has been developed for the simultaneous quantification of ten benzimidazole fungicides in fruits. Herein, covalent organic frameworks (COFs) and ionic liquids (ILs) were successfully introduced to prepare open-tubular capillary column to improve the loading capacity and separation performance. The parameters effecting the analytical performance including pH and concentration of running buffer, separation voltage and the addition of organic solvent were investigated systematically. Under the optimized conditions, the method allowed the baseline separation of ten benzimidazole fungicides, and showed a good linearity in the range of 3.5–200 μg kg −1 with the detection limits between 1.0 and 2.8 μg kg −1 . The intraday and interday precisions for recoveries were lower than 7.9% and 12.2%, respectively. Intraday and interday precisions for their retention times were lower than 3.2% and 6.6%, respectively. Satisfactory recoveries for grape, pear and orange samples at two concentrations were obtained ranging from 85.0 to 95.9% with RSDs lower than 7.8%, demonstrating the potential applications of the open-tubular capillary electrochromatography method for trace benzimidazole fungicides analysis in fruits. Graphical abstract
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Green Chemical Engineering
·
2022
·
IF 0
Lingling Peng,Mingzhen Shi,Xiaomin Zhang,Wenjie Xiong,Xingbang Hu,Zhuoheng Tu,Youting Wu
Selective separation of CO 2 and H 2 S from CH 4 is of importance to the natural gas upgrading because of its corrosivity. As is well known, amine group can recognize reversibly CO 2 and H 2 S with a moderate interaction. With this in mind, this work prepared a series of amine-functionalized supported-protic-ionic-liquid membranes (SPILMs) for the selective separation of CO 2 and H 2 S from CH 4 . For comparison, aprotic ionic liquid membrane was also prepared for natural gas sweetening. The effect of temperature and transmembrane pressure difference on the permeability of single gas and ideal selectivity of CO 2 /CH 4 and H 2 S/CO 2 were studied. Facilitated transport mechanism was studied by NMR spectra. The permeability of CO 2 in primary amine functionalized [DMPDAH][Tf 2 N]-based membrane decreases with the increasing transmembrane pressure, indicating a typical feature of facilitated transport membrane. The permeability of CO 2 and the ideal selective of CO 2 /CH 4 are as high as 2000 barrers and 53.2 at 313.2 K in [DMPDAH][Tf 2 N] membrane, significantly higher than those in conventional ILs membrane. It is anticipated that these amine-functionalized SPILMs can provide alternative insight for the selective separation of CO 2 and H 2 S from CH 4 .
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FOOD CHEMISTRY
·
2017
·
IF 4.529
Shuya Wang,Ziwei Yang,Na Peng,Jun Zhou,Xiaoyu Yong,Haoran Yuan,Tao Zheng
Ionic liquids-based microwave-assisted hydrolysis was successfully applied for hydrolysis of puerarin and daidzein derivatives from Radix Puerariae Lobatae extract. The ionic liquids with different cations and anions have been investigated, and [Omim]HSO 4 was selected as catalyst. In addition, the hydrolysis parameters, including catalyst quantity, ionic liquids concentration, microwave power and microwave time, were optimized by Response Surface Methodology. The optimal conditions were as follows: 0.82 mol/L [Omim]HSO 4 ; catalyst quantity, 1.42 mL; microwave time, 7 min; microwave power, 400 W. Under those condition the average hydrolysis efficiency of puerarin and daidzein derivatives was 57.93 ± 3.08%. Compared with the traditional acidic catalysts, the [Omim]HSO 4 exhibited higher efficiency, which demonstrates that ionic liquids-based microwave-assisted hydrolysis was a rapid, efficient, and simple hydrolysis technique.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2021
·Vol. 35
·期 4
·e6147
·
IF 4.105
Sujuan Ge,Yuming Zhou,Xiaoli Sheng,Chunfeng Mao,Lina Zhao,Jianxing Xu,Lei Qiu
Piperidinium-based ionic liquids (ILs) were synthesized under mild conditions by coordinating N -alkyl- N -methylpiperidinium bromide ([Pip 1,x ]Br) with anhydrous AlCl 3 . The weak basicity of N -methylpiperidine had little impact on downstream problems from proton impurities and catalyst poisoning. The results of Fourier transform infrared (FT-IR), electrospray ionization mass spectrometry (ESI-MS), and nuclear magnetic resonance ( 27 Al NMR) confirmed that the active components in [Pip 1,x ]Br-2AlCl 3 ( χ = 0.67) were [Al 3 Cl 9 Br] − and [Al 2 Cl 6 Br] − . Besides, the reaction performance of [Pip 1,8 ]Br-2AlCl 3 under different conditions was carried out by single-factor experiment and further confirmed by orthogonal experimental method. Among these reaction conditions, the optimal combination was the reaction temperature of 40°C, ILs/O molar ratio of 0.2:1, px/O molar ratio of 12:1, and the reaction time of 30 min. Furthermore, [Pip 1,8 ]Br-2AlCl 3 had excellent stability and can be recycled 14 times. It was the high-efficiency catalytic activity and prominent recyclability that made continuous industrial production possible.
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Journal of Oleo Science
·
2017
·
IF 1.076
Gaoshang Wang,Shangde Sun
Estolides of ricinoleic acid (RA) have been used as lubricants and pigment dispersant in many industries. In this paper, functional acid ionic liquids (ILs) were firstly used as catalysts to prepare RA estolides by the esterification of RAs in solvent-free system. Different ILs were used as catalysts for the esterification. Effect of reaction variables (IL amount, reaction temperature and reaction time) on the esterification were also investigated and optimized using response surface methodology (RSM). Among all tested ILs, [BSO3HMIM]TS showed the best performance for the esterification. Arrhenius equation for the esterification was lnV0 =14.897-7558.7/T, and the activation energy (Ea) was 62.84 kJ/mol. A high degree of polymerization with an acid value of 48.0±2.5 mg KOH/g was achieved at the optimized conditions (IL load 12%, reaction temperature 140°C, and reaction time 12 h). The effect of reaction variables on the esterification decreased in the order of catalyst loading of IL > reaction temperature > reaction time.
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JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Siru Ren,Song Xue,Xiaodong Sun,Mengjie Rui,Li Wang,Qi Zhang
In this work, tetraalkylammonium amino acid ionic liquids (TAA-AAILs) were first applied to non-aqueous capillary electrophoresis (NACE) to establish synergistic systems with a conventional chiral selector, native β-cyclodextrin (β-CD). Excellent enantioseparations of some dansyl-amino acid (Dns-AA) samples were achieved. A series of comparison experiments and a molecular docking study were performed to validate the synergistic effect of TAA-AAILs and β-CD in NACE. Several interesting results were observed compared with previously reported chiral ILs-related aqueous CE studies. In particular, the direct enantioselectivity of TAA-AAILs was observed for the first time by using it as sole chiral selector in NACE. This was an encouraging finding because it was the first direct and convincing evidence that AAILs were able to participate in the enantiorecognition process in the conventional chiral selectors-based synergistic systems. The new TAA-AAILs synergistic NACE system was further optimized in terms of alkyl chain length, TAA-AAILs concentration, β-CD concentration, electrolyte composition and applied voltage, etc. Best enantioseparations of Dns-AAs were obtained when 100 mM β-CD and 10 mM tetramethylammonium- l -arginine (TMA- l -Arg) were added in an NMF buffer containing 50 mM Tris and 35 mM CA (apparent pH 7.85) under UV detection. The applied voltage was set at 30 kV. The method was then successfully employed for the determination of enantiomeric impurities of a real AA sample. This work proved that the use of chiral ILs as additives in NACE is a promising approach for enantioseparation.
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yunhui Xia,Chengmei Huang,Jingsheng Wang,Guohui Cai,Mengjia Zhang,Jianghui Lin,Ling Li
The direct synthesis of dimethyl carbonate (DMC) from carbon dioxide (CO2) and methanol (CH3OH) represents one of the most attractive strategies in green chemistry, offering 100% atom economy for CO2 utilization. However, this reaction faces significant thermodynamic and kinetic challenges, limiting its practical application. To overcome these barriers, the development of highly efficient catalysts capable of effectively activating the CO2 is essential to achieve industrially viable DMC yields. Herein, a series of poly(ionic liquids) (PILs)@MOF-808 nanocomposites (including poly[AlDBU]Br@MOF-808, poly[AlDBN]Br@MOF-808, and poly[AlTMG]Br@MOF-808) were successfully synthesized via in situ polymerization. These composites integrate Lewis basic N sites, Lewis acidic Zr centers, and nucleophilic Br– within a MOF-808 framework. The nanocomposites were evaluated in a batch autoclave for the direct synthesis of DMC from CO2 and CH3OH. Among them, poly[AlDBU]Br@MOF-808 showed the highest DMC yield. Through systematic optimization of the poly[AlDBU]Br loading and reaction parameters (including temperature, CO2 pressure, and time), a maximum DMC yield of 2.52 mmol·g–1cat was achieved with poly[AlDBU]Br@MOF-808-0.4 at 120 °C under 3 MPa of CO2 for 5 h. Experimental studies and in situ DRIFTS confirmed the synergistic catalytic effect between MOF-808 and the PILs, highlighting their cooperative role in enhancing CO2 activation and DMC formation. The catalytic performance of poly[AlDBU]Br@MOF-808-0.4 is competitive compared to previously reported catalysts. The fundamental understanding of the synergistic effects between MOF-808 and PILs offers groundbreaking insights for CO2 capture and utilization strategies in direct DMC synthesis.
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DOI
PubMed
高影响因子
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