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  • [Wiley数据库][2013] Influence of ionic liquids as electrolyte additives on chiral separation of dansylated amino acids by using Zn(II) complex mediated chiral ligand exchange CE
  • 更新时间:2016-05-10;信息类型:期刊文章
  • In this work, investigation of the comparative influence of diverse ionic liquids (ILs) as electrolyte additives on the chiral separation of dansylated amino acids by using Zn(II)-Larginine complex mediated chiral ligand exchange CE (CLE-CE) was conducted. It has been found that not only the varied substituted group number, but also the alkyl chain length of the substituted group on imidazole ring in the structure of ILs show different influence on chiral separation of the analytes in the CLE-CE system, which could be understood by their direct influence on EOF. Meanwhile, the variation of anion in the structure of ILs displayed remarkably changed performance and the ILs with Cl− showed the most obvious promoting effect on the chiral separation performance. Among the investigated seven ILs, 1-butyl-3-methylimidazoliumchloride was validated to be the proper electrolyte additive in the CLE-CE system. Moreover, it has been observed that 1-butyl-3-methylimidazolium chloride also has obvious promotive effect on the labeling performance. The results have demonstrated that the ILs with different structures have important relation to their performance in CLE-CE and to their labeling efficiency in dansylation of the analytes.
  • 链接地址:http://www.ionicliquid.org/download/c-articles/2016-05-10/355.html
  • [Wiley数据库][2013] 11α hydroxylation of 16α, 17-epoxyprogesterone in biphasic ionic liquid/water system by Aspergillus ochraceus
  • 更新时间:2016-05-10;信息类型:期刊文章
  • The improved efficiency of steroid biotransformation using the biphasic system is generally attributed to the positive effect on the solubility of substrate in aqueous media. A promising alternative for the application of organic solvents in biphasic systems is the use of ionic liquids (ILs). This study aims to investigate the applicability of the biphasic ILs/water syste for 11α hydroxylation of 16α, 17-epoxyprogesterone (HEP) by Aspergillus ochraceus. RESULTS: Of the seven ILs tested, [C3mim][PF6] exhibited the best biocompatibility, with markedly improved biotransformation efficiency. In the [C3mim][PF6]-based biphasic system, substrate conversion reached 90% under the condition in which buffer pH, volume ratio of buffer to ILs, cell concentration, and substrate concentration were 4.8, 10/1, 165 g L−1 and 20 g L−1, respectively. This is more efficient than that of the monophasic aqueous system. The effects of the cations and anions of these ILs on the 11α hydroxylation of 16α, 17-epoxyprogesterone (HEP) by A. ochraceus is also discussed. CONCLUSION: The above results showed that IL/water biphasic system improved the efficiency of 11α hydroxylation of 16α, 17-epoxyprogesterone (HEP) by A.ochraceus, thus suggesting the potential industrial application of ILs-based biphasic systems for steroid biotransformation.
  • 链接地址:http://www.ionicliquid.org/download/c-articles/2016-05-10/354.html
  • [Wiley数据库][2013] Quantification of Ionic Liquids Concentration in Water and Qualification of Conjugated and Inductive Effects of Ionic Liquids by UV Spectroscopy
  • 更新时间:2016-05-10;信息类型:期刊文章
  • The determination of the concentrations of ionic liquids (ILs) in water by UV spectroscopy was proposed. The effects of alkyl chain length, anion, cation, and C2 methylation of ILs were systematically investigated. The concentration detection limit ranges from 0.625 to 80 mg/L, and can be extended by changing the path length of the UV cuvette. In addition, the conjugated and inductive effects of ILs were analyzed by the maximum absorption wavelength λmax. Cations without conjugated effect (e.g., pyrrolidium, tetraammonium, and tetraphosphonium) show no UV spectra peak, while cations with conjugated effects (e.g., imidazolium, and pyridinium) present UV spectra peaks. Electron-donating substitute groups (e.g., alkyl, C2 methylation) induce a larger value of maximum absorption wavelength λmax than the electron-withdrawing substitute groups (e.g., amine, non-C2 methylation). These findings are helpful to detect and quantify the concentration of ILs in water.
  • 链接地址:http://www.ionicliquid.org/download/c-articles/2016-05-10/353.html
  • [Wiley数据库][2013] Crystal-Facet Engineering of Ferric Giniite by Using Ionic-Liquid Precursors and Their Enhanced Photocatalytic Performances under Visible-Light Irradiation
  • 更新时间:2016-04-30;信息类型:期刊文章
  • In the work presented here, well-dispersed ferric giniite microcrystals with controlled sizes and shapes are solvothermally synthesized from ionic-liquid precursors by using 1-n-butyl-3-methylimidazolium dihydrogenphosphate ([Bmim][H2PO4]) as phosphate source. The success of this synthesis relies on the concentration and composition of the ionic-liquid precursors. By adjusting the molar ratios of Fe(NO3)3•9H2O to [Bmim][H2PO4] as well as the composition of ionic-liquid precursors, we obtained uniform microstructures such as bipyramids exposing {111} facets, plates exposing {001} facets, hollow spheres, tetragonal hexadecahedron exposing {441} and {111} facets, and truncated bipyamids with carved {001} facets. The crystalline structure of the ferric giniite microcrystals is disclosed by various characterization techniques. It was revealed that [Bmim][H2PO4] played an important role in stabilizing the {111} facets of ferric giniite crystals, leading to the different morphologies in the presence of ionic-liquid precursors with different compositions. Furthermore, since these ferric giniite crystals were characterized by different facets, they could serve as model Fenton-like catalysts to uncover the correlation between the surface and the catalytic performance for the photodegradation of organic dyes under visible-light irradiation. Our measurements indicate that the photocatalytic activity of as-prepared Fenton-like catalysts is highly dependent on the exposed facets, and the surface area has essentially no obvious effect on the photocatalytic degradation of organic dyes in the present study. It is highly expected that these findings are useful in understanding the photocatalytic activity of Fentonlike catalysts with different morphologies, and suggest a promising new strategy for crystal-facet engineering of photocatalysts for wastewater treatment based on heterogeneous Fentonlike process.
  • 链接地址:http://www.ionicliquid.org/download/c-articles/2016-04-30/352.html
  • [Wiley数据库][2013] Understanding the Effect Models of Ionic Liquids in the Synthesis of NH4-Dw and γ-AlOOH Nanostructures and Their Conversion into Porous γ-Al2O3
  • 更新时间:2016-04-30;信息类型:期刊文章
  • Well-dispersed ammonium aluminum carbonate hydroxide (NH4-Dw) andγ-AlOOH nanostructures with controlled morphologies have been synthesized by employing an ionic-liquid-assisted hydrothermal process. The basic strategies that were used in this work were: 1) A controllable phase transition from NH4-Dw toγ-AlOOH could be realized by increasing the reaction temperature and 2) the morphological evolution of NH4-Dw andγ-AlOOH nanostructures could be influenced by the concentration of the ionic liquid. Based on these experimental results, the main objective of this work was to clarify the effect models of the ionic liquids on the synthesis of NH 4-Dw andγ-AlOOH nanostructures, which could be divided into cat- ionic- or anionic-dominant effect models, as determined by the different surface structures of the targets. Specifically, under the cat -ionic-dominant regime, the ionic liquids mainly showed dispersion effects for the NH4-Dw nanostructures, whereas the anionicdominant model could induce the selfassembly of theγ-AlOOH particles to form hierarchical structures. Under the guidance of the proposed models, the effect of the ionic liquids would be optimized by an appropriate choice of cations or anions, as well as by considering the different effect models with the substrate surface. We expect that such effect models between ionic liquids and the target products will be helpful for understanding and designing rational ionic liquids that contain specific functional groups, thus open up new opportunities for the synthesis of inorganic nanomaterials with new morphologies and improved properties. In addition, these as-prepared NH4-Dw andγ-AlOOH nanostructures were converted into porous γ-Al2O3 nanostructures by thermal decomposition, whilst preserving the same morphology. By using HRTEM and nitrogen-adsorption analysis, the obtained γ-Al2O3 samples were found to have excellent porous properties and, hence, may have applications in catalysis and adsorption.
  • 链接地址:http://www.ionicliquid.org/download/c-articles/2016-04-30/351.html
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