共查询到15条相似文献,搜索用时 93 毫秒
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采用超声波反应器,以邻苯二酚、二甘醇和对甲基苯磺酰氯等为原料,二甲亚砜为溶剂,氢氧化钾为催化剂兼模板剂,合成二苯并-18-冠-6(DB18C6)。产物经IR和^1HNMR表征。合成收率达到42%。较之传统方法具有操作简单、反应时间短、反应条件温和等优势。 相似文献
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二苯并-18-冠-6的合成条件的优化 总被引:3,自引:0,他引:3
通过改变溶剂的极性、离子性、离去基团的活性及反应温度等方法,对传统的Pedersen冠醚合成法进行了优化,使目标产物的最高产率达到71%以上.产物通过IR、1H NMR及元素分析等方法进行结构表征. 相似文献
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A combination of molecular dynamics (MD) and density functional theory (DFT) calculations were used to study the hydration structures of K+ and Na+ ions under the confinement of 18-crown-6 in order to identify the role of water in the selectivity of 18-crown-6 towards K+. The radial distribution functions, coordination numbers, orientation structures and interaction energies were analyzed to investigate the hydration of K+ and Na+ in 18-crown-6/cation complexes. All calculations of K+ and Na+ in bulk water were also conducted for comparison. The simulation results show that the orientation distributions of the water molecules in the first coordination shell of K+ are more sensitive to the confinement of 18-crown-6 than those of Na+. It is more favorable to confine a K+ in 18-crown-6 than a Na+ in terms of interaction energy. Good agreement is obtained between MD results and DFT results. 相似文献
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铅是一种对环境和人体有严重危害的重金属污染物,研究铅离子(Pb2+)检测技术具有重要的实用意义。近年来,利用18-冠-6的Pb2+特异识别性能,研究者们设计构建了一系列智能高分子材料系统,为Pb2+检测提供了新的策略和途径。本文综述了近年来基于18-冠-6的Pb2+检测技术研究进展,重点介绍了基于智能膜、智能光学元件、智能微芯片、智能微胶囊等智能材料系统的Pb2+检测技术,讨论了这些Pb2+检测技术在实际应用中需要重点关注和解决的问题,以期为这类基于18-冠-6的Pb2+检测技术的进一步开发和应用提供参考。 相似文献
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Mojtaba Shamsipur Mohammad Hossein Mashhadizadeh 《Separation and Purification Technology》2000,20(2-3):147-153
Hexathia-18-crown-6 (HT18C6) was used as a specific ion carrier for the transport of silver ion through a chloroform bulk liquid membrane. In the presence of thiosulfate ion as a suitable stripping agent in the receiving phase, the amount of silver transported across the liquid membrane after 60 min is 99.5±1.0%. The selectivity of Ag+ transport from the aqueous solutions containing other Mn+ cations such as Tl+, Mg2+, Ca2+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Pb2+, Hg2+, and Cr3+ ions was investigated. Except with Hg2+ ion, non of the cations used interfere the silver transport, even at a Mn+/Ag+ molar ratio of 500. The interfering effect of Hg2+ ion was successfully eliminated in the presence of EDTA at pH 5. 相似文献
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以多孔硅胶为基质,固相合成并制备了一种新型丙氧基-18-冠-6键合固定相(P18-C-6 SB),详细研究了其合成反应条件。P18-C-6 SB 是一种热稳定性好、耐溶剂,表面键合浓度高的色谱固定相。已应用于芳香族异构体及同系物的分离。 相似文献