Anion recognition and cation-induced molecular motion in a heteroditopic [2]rotaxane.
Anion recognition and cation-induced molecular motion in a heteroditopic [2]rotaxane.
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异二位[2]轮烷中的阴离子识别和阳离子诱导的分子运动。
DOI:
10.1002/chem.201002405
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发表时间:
2011
期刊:
影响因子:
--
通讯作者:
Leontiev AV
中科院分区:
文献类型:
--
作者:
Leontiev AV
A heteroditopic [2]rotaxane consisting of a calix[4]diquinone–isophthalamide macrocycle and 3,5‐bis‐amide 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 by1H 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.
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DOI:
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