Synthesis of a Novel 1-Ethyl-3-methylimidazolium Chloride Ionic Liquid Molecularly Imprinted Polymer and Its Properties of Specific Adsorption and Solid Phase Extraction

Abstract

1-Ethyl-3-methylimidazolium chloride (C 2 mimCl) ionic liquid molecularly imprinted polymer (C 2 mimClMIP/PS-DVB) was prepared on the surface of poly(styrene-divinylbenzene) (PS-DVB) by using C 2 mimCl as the template molecule, methacrylic acid (MAA) and ethyleneglycol dimethacrylate (EGDMA) as the bifunctional monomer. The preparation conditions were optimized and the molar ratio of 1∶4∶14 for C 2 mimCl∶MAA∶EGDMA was selected as the optimal polymerization molar ratio. Then infrared spectra (IR) spectrophotometer, scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) surface area and pore size analyzer were used to characterize the molecularly imprinted polymer, it was shown that C 2 mimClMIP/PS-DVB was successfully prepared on the surface of PS-DVB. The static adsorption experiments were performed in acetonitrile to investigate the adsorption properties and selective recognition characteristics of the polymer for C 2 mimCl and its structural analogues. Selective adsorption experiments showed that C 2 mimClMIP/PS-DVB has high selectivity for C 2 mimCl and C 4 mimCl. Adsorption isotherm experiments suggested that the maximum adsorption capacity of C 2 mimClMIP/PS-DVB and C 2 mimClNIP/PS-DVB for C 2 mimCl was 144.71 µmol/g and 22.56 µmol/g, respectively, and for C 4 mimCl was 124.53 µmol/g and 21.42 µmol/g. While the total number of binding sites N t , mean association constant K 0 and the heterogeneity index m of C 2 mimClMIP/PS-DVB were 130.9 µmol/g, 0.37 L/mmol and 0.8, respectively. C 2 mimClMIP/PS-DVB solid phase extraction column was prepared to investigate the solid phase extraction properties of C 2 mimClMIP/PS-DVB. Various parameters, such as the loading volume, flow rate and eluent solvent, were optimized for the C 2 mimClMIP/PS-DVB solid phase extraction column experiments. Then the dynamic adsorption experiments were carried out by coupling C 2 mimClMIP/PS-DVB solid phase extraction column with high performance liquid chromatography (HPLC), it was shown that C 2 mimClMIP/PS-DVB solid phase extraction column could separate and enrich

Synthesis and Catalytic Activity of Novel Heternuclear Dication Brønsted Acidic Ionic Liquids

“…因其具有难挥发、不易燃烧、 热稳定性高等优良的物理化学性质及可调变的阴阳离 子结构, 能加速化学反应又具有催化活性高、 选择性好、 产物易分离、且可循环使用等特点, 被用作传统易挥发, 易燃易爆的有机溶剂和催化剂的代用品 [2,3] , 非常符合 当今"绿色化学"节能环保的要求, 由此被广泛应用到 不同的研究领域. 如室温离子液体作为溶剂, 使催化系 统具有极高的稳定性, 用于不同钯催化剂催化 Suzuki 反 应 [4] 及 Cr(III)-Al 2 O 3 支载型催化剂催化由果糖制备 5-羟 基糠醛反应 [5] ; 可作为染料敏感太阳能电池的电解质溶 液, 为电池反应提供稳定的碘源 [6] ; 作为辅助激光解析 电离质谱中的基质, 可高效提高寡糖/糖肽的离子化率, 从而提高了仪器的检测灵敏度 [7] ; 通过"稼接"法将离 子液体连接在用于混合模式高效液相色谱固定相的多 孔聚合物整体柱中, 可有效改进 HPLC 的分离容量和效 率 [8] ; 将离子液体作为模板分子制备成表面印迹聚合物, 可对该模板分子及其结构类似物有高度的选择性识别 作用, 实际应用于废水中离子液体的回收 [9] 等. 直接作 催化剂的离子液体可用于水相中催化二茂铁醇的类 Friedel-Crafts 反应 [10] , 碱性聚合型离子液体用于催化 Claisen-Schmidt 缩合反应 [11] , 以及新型固载型碱性离子 液体用于催化 Henry 反应 [12] 、三烷基胺 [18] 、2-吡咯烷酮 [19] 和吗啉 [20] 等单磺酸基, 以及基于三亚乙基二胺 [21] 、咪唑 [22] 、双咪唑 [23] 和双吡 咯 [24] 、哌嗪 [16] 双磺酸基功能化酸性离子液体在内, 均来 源于已商品化的常见含氮杂环内核化合物的直接磺酸 功能化, 取材受限, 总体数量还相对较少.…”

Phosphonium Ionic Liquids-Accelerated Morita-Baylis-Hillman Reaction

“…1 156.43, 129.89, 127.65, 127.32, 125.90, 121.09, 117.33, 110.96, 70.00, 55.44. 2-{[4-(2- 130.96, 127.46, 126.76, 117.87, 72.86;IR (KBr) ν: 3410, 3052, 2853, 2235,1622, 1515, 1411, 1057 H 5.03, N 11.66; found C 69.74, H 5.37, N 11.58. 2-(1-萘基-羟基-甲基)-丙烯腈( Table 2, Entry 13) [24] : 139.55, 136.79, 134.58, 133.39, 132.07, 131.96, 129.91, 129.56, 129.09, 128.74, 128.08, 127.01, 120.87, 73.31. 2-(1-羟基正丙基)-丙烯腈( …”