A Novel Supramolecular System: Combination of Two Switchable Processes in a [2]Rotaxane

A novel supramolecular system, which is made up of a dibenzo[24]crown‐8 (DB24C8) ring component linked with a calix[4]arene derivative, a dumbbell component, containing a secondary ammonium center (‐NR2H2+‐) and a 4,4′‐bipyridinium (BIPY2+) unit, and stoppered with two 3,5‐di‐tert‐butylphenyl groups...

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Bibliographic Details
Published in:Chemistry, an Asian journal an Asian journal, 2008-12, Vol.3 (12), p.2091-2096
Main Authors: Li, Junbo, Li, Yongjun, Guo, Yanbing, Xu, Jialiang, Lv, Jing, Li, Yuliang, Liu, Huibiao, Wang, Shu, Zhu, Daoben
Format: Article
Language:English
Subjects:
calixarenes
complexation
molecular devices
Molecular Structure
rotaxanes
Rotaxanes - chemical synthesis
Rotaxanes - chemistry
supramolecular chemistry
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Summary:A novel supramolecular system, which is made up of a dibenzo[24]crown‐8 (DB24C8) ring component linked with a calix[4]arene derivative, a dumbbell component, containing a secondary ammonium center (‐NR2H2+‐) and a 4,4′‐bipyridinium (BIPY2+) unit, and stoppered with two 3,5‐di‐tert‐butylphenyl groups on the two termini of the dumbbell component, has been synthesized. The system displays a combination of two processes: the pH‐induced shuttling of a DB24C8 ring and the complexation/decomplexation of K+ ions. The switching process of this supramolecular system was investigated in detail by 1H NMR spectroscopy. The results showed that the supramolecular system can only switch smoothly in CD3CN. The two separated switchable processes can run together smoothly in this supramolecular system. Dual mode: We have designed and synthesized a novel [2]rotaxane‐based supramolecular system. The system displays a combination of two processes: the pH‐induced shuttling of a ring component and the complexation/decomplexation of K+ ions with a calix[4]arene derivative.
ISSN:1861-4728
1861-471X
DOI:10.1002/asia.200800217