Anion Recognition and Cation-Induced Molecular Motion in a Heteroditopic [2]Rotaxane

被引：23

作者：

Leontiev, Alexandre V. ^{[1
]}

Jemmett, Charlotte A. ^{[1
]}

Beer, Paul D. ^{[1
]}

机构：

[1] Univ Oxford, Chem Res Lab, Dept Chem, Oxford OX1 3TA, England

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2011年 / 17卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

anions; molecular motion; receptors; rotaxanes; template synthesis; INDUCED TRANSLATIONAL ISOMERISM; ION-PAIR RECOGNITION; ROTAXANE; CATENANE; TEMPLATE; PSEUDOROTAXANES; PORPHYRINS; RECEPTORS; STRENGTH; MOTORS;

D O I：

10.1002/chem.201002405

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A heteroditopic [2]rotaxane consisting of a calix[4]diquinone-isophthalamide macrocycle and 3,5-bisamide pyridinium axle components with the capability of switching between two positional isomers in response to barium cation recognition is synthesised. The anion binding properties of the rotaxane's interlocked cavity together with Na+, K+, NH4+ and Ba2+ cation recognition capabilities are elucidated by H-1 NMR and UV-visible spectroscopic titration experiments. Upon binding of Ba2+, molecular displacement of the axle's positively charged pyridinium group from the rotaxane's macrocyclic cavity occurs, whereas the monovalent cations Na+, K+ and NH4+ are bound without causing significant co-conformational change. The barium cation induced shuttling motion can be reversed on addition of tetrabutylammonium sulfate.

引用

页码：816 / 825

页数：10

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