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1·It is a challenge for people to design more highly selective crown ether for single metal ions.

如何设计对单一金属离子具有高选择性的冠醚，一直是人们所面临的具有挑战性的课题。

2·This paper contains the following three part research work: Synethsis of crown ether-based ionic liquids.

本论文主要包括以下三个部分的研究工作：冠醚型离子液体的合成。

3·This is an overall review about the development of synthesis and applications of chiral crown ether compounds.

对近几年来的手性大环冠醚化合物的合成及应用研究进展作了较为全面的综述。

4·Several crown ether derivatives possessing phenanthroline groups were prepared and their gelation properties with ammonium were investigated.

本文设计合成了几种含邻菲咯啉的冠醚衍生物，并研究了它们与几种铵盐形成水凝胶的行为。

5·Excellent selectivity was obtained for the separations of polar position isomers. The benzamide substituent group on crown ether makes the stationa…

由于冠醚上引入苯甲酰胺取代基，因而对苯胺类及不经衍生化的碱性化合物能特殊选择性地分离。

6·Calixarene is a kind of respecting host macrocyclic compound followed cyclodextrin and crown ether, and has strong ability of selective extraction of metal ions.

杯芳烃作为继环糊精、冠醚之后的第三代大环类主体化合物，对金属离子具有较强的选择性萃取作用。

7·The results show that the crown ether extraction- neutron activation method can be satisfactorily applied to the separation and determination of trace rhenium in rock samples and complex systems.

研究结果表明冠醚萃取中子活化法可较好地用于岩石和复杂体系中痕量铼的分离分析。

8·Thirdly, the binding energy of a crown-ether molecule complexing with an alkali-metal ion is estimated.

最后估算了冠醚分子络合碱金属离子的结合能。

9·This 5-ht ISE was prepared using 18-crown-6 as an active component and phosphoric acid tris (2-ethylhexyl ether) as a plastifier.

电极敏感膜的活性成分是18 -冠- 6，增塑剂为磷酸三(2 -乙基己基)酯。