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2008•Chemistry - An Asian JournalRequires access

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

Junbo Li, Yongjun Li, Yanbing Guo, Jialiang Xu, Jing Hui Lv, Yuliang Li, Huibiao Liu, Shu Wang, Daoben Zhu

Open publisher page 14 citations

Abstract

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 (-NR(2)H(2) (+)-) and a 4,4'-bipyridinium (BIPY(2+)) 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 (1)H NMR spectroscopy. The results showed that the supramolecular system can only switch smoothly in CD(3)CN. The two separated switchable processes can run together smoothly in this supramolecular system.

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What this paper is about

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 (-NR(2)H(2) (+)-) and a 4,4'-bipyridinium (BIPY(2+)) 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 (1)H NMR spectroscopy. The results showed that the supramolecular system can only switch smoothly in CD(3)CN. The two separated switchable processes can run together smoothly in this supramolecular system.

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Available abstract

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 (-NR(2)H(2) (+)-) and a 4,4'-bipyridinium (BIPY(2+)) 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 (1)H NMR spectroscopy. The results showed that the supramolecular system can only switch smoothly in CD(3)CN. The two separated switchable processes can run together smoothly in this supramolecular system.

Key concepts: Supramolecular chemistry, Rotaxane, Dumbbell, Ring (chemistry), Derivative (finance), Chemistry, Component (thermodynamics), Crystallography

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