JOURNAL OF SOLUTION CHEMISTRY
·
2020
·Vol. 49
·期 2
·145-165
·
IF 1.273
Yang Xuzhao,Wang Jun,Fang Yun
Asymmetrical ammonium-based gemini ionic liquids, 1-trimethylammonium-3-(1-methylpiperidinium)propane dibis[(trifluoromethyl)sulfonyl]imide ([N 111 C 3 MPip][NTf 2 ] 2 ) and 1-trimethylammonium-3-(4-methylmorpholinium)propane dibis[(trifluoromethyl)sulfonyl]imide ([N 111 C 3 MMor][NTf 2 ] 2 ), were synthesized and structurally characterized by 1 H NMR, 13 C NMR, and MS. The melting temperatures and associated enthalpies and entropies of fusion of these gemini ionic liquids have been determined through differential scanning calorimetry (DSC). Thermal stabilities of [N 111 C 3 MPip][NTf 2 ] 2 and [N 111 C 3 MMor][NTf 2 ] 2 have been investigated by thermogravimetric analysis technology under pure nitrogen atmosphere. The solubility data of [N 111 C 3 MPip][NTf 2 ] 2 and [N 111 C 3 MMor][NTf 2 ] 2 in water, ethanol, benzyl alcohol, 2-phenylethanol and n -heptane were determined by a synthetic method using a laser monitoring observation technique in the temperature range 298.15–333.15 K under atmospheric pressure. The solubility in all pure solvents increased with the increasing temperature and the greatest solubilities of both gemini ionic liquids were observed in benzyl alcohol. The modified Apelblat, Buchowski–Ksiazaczak λh and NRTL models were employed to correlate the experimental solubility data. The calculated results show good agreement with the experimental data and modified Apelblat and λh equations are more accurate than the NRTL model. The standard state enthalpy, entropy, and Gibbs energy of dissolution of the GILs in the studied solvents were evaluated through the van′t Hoff equation using the experimental solubility data. The excess enthalpies of the solutions were also determined by the λh model. The dissolution behavior can serve for the synthesis and purification process of GILs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Qingshan Liu,Jiamin Chu,Kexin Li,Liansheng Ma,Jian Wang,Ying Zang
The viscosity of four dilution solution systems was determined for ionic liquids (ILs) with Dimethyl Carbonate (DMC) at lower concentration from 288.15 K to 313.15 K. The ILs include 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C 2 mim][NTf 2 ]), 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C 4 mim][NTf 2 ]), 1-ethyl-2,3-dimethylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C 2 mmim][NTf 2 ]), and 1-butyl-2,3-dimethylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C 4 mmim][NTf 2 ]). The viscosities of systems have been discussed at studied concentration from 288.15 to 313.15 K. The temperature dependence on viscosities was fitted according to the Vogel-Fulcher-Tammann equation. The activation energies for viscous flow have been obtained from Arrhenius equation at different concentration range. The relative viscosities ( η r ) were also calculated and analyzed according to the Jones–Dole equation at different molar concentration ranges. The slopes of the parameter, B -coefficient/dm 3 ·mol −1 , dependence on temperature, T /K have also been discussed according to the methyl and methylene groups introduction. The effects of methyl or methylene group introduction on ILs cation have also been discussed to solute–solute or solute–solvent interactions.
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Shaoqi Yang,Guangming Cai,Xingmei Lu,Chenguang Wang,Mi Feng,Junli Xu,Qing Zhou,Jiayu Xin,Longlong Ma
Hydrodeoxygenation (HDO) of lignin-derived phenols and dimeric ethers to biofuels has great significance for advanced utilization of renewable lignocelluloses and the future biobased economy. Herein, we find that the deoxygenation process during the lignin-derived model compound HDO process could efficiently be catalyzed by low-cost protic ionic liquids under mild conditions. 2-Hydroxy-N-(2-hydroxyethyl)-N-methylethanaminium trifluoromethanesulfonate ([BHEM]CF3SO3) shows the highest catalytic activity for the deoxygenation reaction during the lignin-derived compound HDO process with Rh/C as the hydrogenation catalyst. The conversion of phenol is 100% under 4 MPa H2 at 130 °C for 6 h, and the yield of cyclohexane is 93.3%. Furthermore, the catalytic system with [BHEM]CF3SO3 as the deoxygenation catalyst and Rh/C as the hydrogenation catalyst demonstrates efficient catalytic activity for various lignin-derived phenols and dimeric ethers with ≥99.0% conversion and >90.0% selectivity. The catalytic system is reused five times for HDO of phenol to test its stability.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 13
·7751-7757
·
IF 3.119
Xiaoyan Chen,Xiaoyan Luo,Jiaran Li,Rongxing Qiu,Jinqing Lin
In this study, a variety of functionalized ILs with dual sites including amino acid group (AA) and basic anion (R) were synthesized to investigate the suppression and cooperation between the sites in CO2 absorption. The basic anions selected in this study with different basicity include sulfonate (Su), carboxylate (Ac), imidazolium (Im), and indolium (Ind). These ILs ([P66614]2[AA–R]) were applied to CO2 absorption. The results present that CO2 capacity increases first and then decreases later with the continuous increase in the activity of the anion site. Combined with CO2 absorption experiments, IR and NMR spectroscopic analyses and DFT calculation demonstrate that the ability of one site to capture CO2 would be suppressed when the activity of another site is much stronger. Thus, the cooperation of dual site-functionalized ILs and high CO2 capacity might be achieved through balancing the two sites to be equivalent. Based on this point, [P66614]2[5Am–iPA] was further synthesized by taking the advantage of the conjugated benzene ring. As expected, [P66614]2[5Am–iPA] showed capacity as high as 2.38 mol CO2 per mol IL at 30 °C and 1 bar without capacity decrease even after 10 times recycling performance of CO2 absorption and desorption.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xue Lv,Chuang Liu,Zhubao Shao,Shixin Song,Shulin Sun
Ionic liquids (ILs) hydrogels as an appropriate candidate for the absorption of nanoparticles have gained immense interest because of its environmental friendliness, low cost, high efficiency, and insensitivity to toxic substances. However, conventional ILs hydrogels usually suffer from brittleness and mechanical defects. Herein, a novel entrapped pattern and structural transformation of ILs within a copolymer of acrylamide/N,N-dimethylaminoethyl methacrylate bromododecane hydrophobic monomers p(AM/DMLB)-based hydrogels were prepared through changing the filling pattern of ILs to form toughened hydrophobic association hydrogels. After the ionic liquids latex sphere particles (ILs-LPs) were added, both the ionically cross-linked network and hydrophobic association network were fabricated, which could effectively reconstruct the structure and dissipate energy. It was found that the p(AM/DMLB)/ILs-LPs hydrogels possessed high mechanical properties, and the tensile strength, elongation, and toughness reached 0.49 MPa, 2300%, and 4.9 MJ/m3, respectively. Without the addition of other additives and cross-linking agents, the hydrogel could act as a template for in situ and stable Pd nanoparticles. More importantly, the excellent biocompatibility, remoldability, and fatigue resistance endowed the p(AM/DMLB)/ILs-LPs hydrogels/Pd with recycled and reused performances, which was possible for bestowing samples with any desired shape and even giving them the ability to serve as catalysts for promising practical applications. Therefore, the innovative design strategy for ionic liquids’ latex sphere particles as the sole joint center of a dual physically cross-linked network could be used to develop robust and stretchable hydrogel materials for catalytic use in the sewage disposal industry.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2020
·
IF 1.701
Shengfu Duan,Yajie Jiang,Tao Geng,Hongbin Ju,Yakui Wang
In this paper, a series of methyltriphenylphosphonium carboxylate room temperature ionic liquids [Ph3PCH3][CnH2n+1COO] with different alkyl chain length (n = 7, 9, 11, 13, 15, 17) have been synthesized by quaternization of triphenylphosphine (TPP) with dimethyl carbonate (DMC) and followed anion exchange with different carboxylic acids. The synthesis route is not only simple, but also can avoid problems such as toxicity, environmental pollution and equipment corrosion. The structures of these compounds were characterized by FT-IR and 1H-NMR. Meanwhile, their surface adsorption and aggregation behavior in aqueous solution have been investigated by equilibrium surface tension, electrical conductivity and transmission electron microscopy (TEM) measurements. Furthermore, the impact of alkyl chain length on their surface adsorption and aggregation behavior were also investigated. TEM results indicated that methyltriphenylphosphonium carboxylate ionic liquid surfactants could self-assemble into regular spherical aggregates in aqueous solution. The diameter of the spherical aggregates is about 50 ∼ 100 nanometers and does not change much with the change of alkyl chain length.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Sehee Kang,Yongchul G. Chung,Jo Hong Kang,Hojun Song
In this study, dual amino group functionalized imidazolium amino acid ionic liquids (AAILs) were synthesized from imidazole , bromoalkylamine, and amino acids. 1-(3-aminopropyl)-3-(2-aminoethyl)imidazolium hydroxide ([Apaeim][OH]), 1-propyl-3-(2-aminoethyl)imidazolium hydroxide ([Paeim][OH]), and 1-ethyl-3-(2-aminoethyl)imidazolium hydroxide ([Eaeim][OH]) were synthesized in two-steps, while [Apaeim][amino acid], [Paeim][amino acid], and [Eaeim][amino acid] were synthesized in three-steps. The structures of the synthesized AAILs were confirmed by 1 H NMR analysis. Moreover, the CO 2 absorption mechanism of [Apaeim][OH] was confirmed by FT-IR and 13 C NMR analyses. Subsequently, CO 2 absorption-desorption tests were conducted under at 15 vol% CO 2 , 313 K and atmospheric pressure. The cation and anion effects on the ionic liquid absorbents were also investigated. Among the tested ionic liquid solutions, 30 wt% [Apaeim][OH] and 30 wt% 1-(3-aminopropyl)-3-(2-aminoethyl)imidazolium alaninate ([Apaeim][ala]) displayed the best performances. Thus, both presented CO 2 cyclic capacities 2.2-fold higher than that of the benchmark CO 2 absorbent 30 wt% monoethanolamine (MEA), while their viscosities were comparable to that of 30 wt% MEA. Notably, 30 wt% [Apaeim][ala] show great potential as a CO 2 absorbent due to its high CO 2 cyclic capacity and low viscosity.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Jinyu Chang,Yuan Yao,Yangfeng Xia,Long Liu,Yanqiang Zhang
5-methyl-3,5-dipropyl-2-pyrazoline is an intermediate for the preparation of new high energy fuels. In this paper, chloroaluminate ionic liquids ([Bmim]Cl-xAlCl 3 , x = 1, 1.2, 1.4, 1.6, 1.8, 2.0) were applied as green catalysts for the synthesis of 5-methyl-3,5-dipropyl-2-pyrazoline through the intramolecular cyclization reaction of 2-pentyl ketazine. The effects of temperature, acidity and dosage of ionic liquids on the cyclization reaction were studied in detail and the highest catalytic performance was under the conditions as 110 °C, [Bmim]Cl-1.6AlCl 3 and 10% of 2-pentyl ketazine. With the theoretical simulations, the possible catalytic mechanism was proposed as the hydrogen-like interaction between Al ([Bmim] + AlCl 4 − ) and N1 atoms, which increases the charge of N2 atoms, thereby improving its nucleophilicity and further making it undergo intramolecular addition reaction with methyl. This study will provide guidance for the green preparation of 5-methyl-3,5-dipropyl-2-pyrazoline.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Didi Dong,Xinyu Zhao,Chun Pu,Yao Yao,Bo Zhao,Ge Tian,Ganggang Chang,Xiaoyu Yang
Hybridization of metal–organic frameworks (MOFs) and homogeneous ionic liquids (ILs) endows the heterogeneous composite with high porosity and accessible multiple active sites (e.g., acidic or basic sites), which exhibits great potential in CO2 capture and conversion. Nevertheless, the majority of MOF composites are synthesized as powders, significantly restricting their practical applications due to inherent problems such as poor handling properties, high pressure drops, and mechanical instability. Thus, it is crucial to shape MOF composites into various monoliths that allow efficient processing, especially for industrial purposes. In this work, a hierarchical ILs@nanoMOF composite gel (H-IL@UiO-66-gel) featuring both intraparticle micropores and interparticle mesopores and multiple active sites was successfully fabricated by a two-step approach. Benefiting from the integrated advantages of the hierarchically porous MOF for enhanced mass transfer and affinity of ILs for activating CO2 molecules, the resultant H-IL@UiO-66-gel exhibits excellent uptake of macromolecules and catalytic activity toward CO2 cycloaddition with epoxides under moderate conditions, far beyond the traditional microporous IL@UiO-66-gel and unfunctionalized H-UiO-66-gel. Furthermore, the H-IL@UiO-66 composite monolith can be effortlessly separated and reused at least three times without depletion of catalytic activity. It is believed that this fabrication method for the shaping of MOF composites is highly versatile and can be extended to other types of MOFs for various application fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Lijun Sun,Shuguo Qu,Xueyan Lv,Luyang Ding,Jihai Duan,Weiwen Wang
Sulfonated poly(ether ether ketone) (SPEEK) is a proton-conducting polymer with certain proton conductivity and thermodynamic properties. However, it still has the disadvantage of low proton conductivity and needs to be modified to improve its performance. Co-MOF-74/phosphate-4-phenylimidazole/SPEEK (Co-MOF-74/[IM2][H2PO4]/SPEEK) ternary composite membranes were prepared using the solution casting method. A small amount of agglomeration on the surface of the Co-MOF-74/[IM2][H2PO4]/SPEEK ternary composite membrane with an increase in Co-MOF-74 content and a gear-like structure were observed in the cross section of the prepared composite membrane through SEM. The proton conductivity of the Co-MOF-74/[IM2][H2PO4]/SPEEK ternary composite membrane increased. The reason is that the metal–organic framework (MOF) encapsulates the ionic liquid (IL) through hydrogen bonding, reducing the loss of IL, thereby improving the proton conductivity of the ternary composite membrane. At 120 °C, the doping amount of Co-MOF-74 was 2.5 wt % within the Co-MOF-74/[IM2][H2PO4]/SPEEK membrane, the proton conductivity of the Co-MOF-74/[IM2][H2PO4]/SPEEK reached 25.96 mS·cm–1, and the IL loss rate in the Co-MOF-74/[IM2][H2PO4]/SPEEK ternary composite membrane ranged from 25 to 30%. The Co-MOF-74/[IM2][H2PO4]/SPEEK ternary composite membrane can be applied within 320 °C. These indicate that encapsulating IL in the MOF not only increases the proton conductivity of the SPEEK membrane but also improves the thermal stability of the SPEEK membrane.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Ke Yuan,Wencai Huang,Tao Zhang,Li Lv,Yan Wang,Zongpeng Zou,Shengwei Tang
Ionic Liquids (ILs) of 1,3-bis-(3-sulfonic acid)propyl imidazolium bisulfate ([PS 2 Im]HSO 4 ) can be used as acid catalyst for its specific acidity. However, it is difficult to obtain high-purity ILs by the reported synthetic methods. The preparation of [PS 2 Im]HSO 4 with N-trimethylsilylimidazole (TSIm) as raw material was studied. The results show that 1-(3-sulfonic acid)propyl-3-H-imidazolium bisulfate ([PSImH]HSO 4 ) and 1,3-bis-H-imidazolium bisulfate ([ImH]HSO 4 ) are easily formed in the process of preparing [PS 2 Im]HSO 4 from TSIm. Some TSIm is encapsuled in the formed solid intermediate 1-(propyl-3-sulfonate)-3-trimethylsilylimidazolium ([TSIm]PS), it leads to the formation of [ImH]HSO 4 . The solid intermediate [TSIm]PS can not be completely depleted in the following reaction for the formation of 1-(3-trimethylsilyl sulfonate)propyl-3-(propyl-3-sulfonate) limidazolium ([PSTSIm]PS). The residual solid intermediate [TSIm]PS leads to the formation of [PSImH]HSO 4 . A novel process using sodium imidazolate (ImNa) as raw material was proposed. [PS 2 Im]HSO 4 was successfully prepared with a purity of 96.2 mol.% and a yield of 69 %. The synthesis mechanism of high purity [PS 2 Im]HSO 4 was revealed by experimental research and DFT computation. Intermediate 1-(3-sodium sulfonate)propyl imidazole (PSNaIm) is formed by the reaction of ImNa and 1,3-PS with a molar ratio of 1:1. PSNaIm can easily be dissolved in DMSO and react with 1,3-PS to obtain 1-(3-sodium sulfonate)propyl-3-(propyl-3-sulfonate) imidazolium ([PSNaIm]PS). After cation exchange and reaction with sulfuric acid, high purity [PS 2 Im]HSO 4 is easily obtained. The results provide a guidance for the synthesis of high-purity imidazole-based ILs containing dual-acidic functional groups.
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Guanai Qu,Hongling Fang,Lei Liu,Yi Li,Songwei Zhang,Huimin Yang,Litian Hu
Although ionic liquids (ILs) have proven to be multifunctional and universal lubricant additives , their solubility in different polar lubricating oils varies greatly. This variability restrains their widespread use as general-purpose lubricating additives. To address this issue, three protic ionic liquids (PILs) with high solubility in lubricating oils with differing polarities were selected as additives, and their tribological performances in polyethylene glycol (PEG) and synthetic pentaerythritol carboxylic ester oil (5750) were systematically investigated. These findings were interesting, as PILs effectively improved the lubrication properties of PEG but impaired those of 5750. Additionally, a variety of surface analysis techniques and MD simulation were employed to further explore the lubrication mechanisms of PILs, and results indicated that they exhibited distinct tribological performance.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）