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[2]Pseudorotaxanes based on the recognition of cryptands to vinylogous viologens
Xuzhou Yan1, Peifa Wei, Mingming Zhang
1Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China.
Abstract:
Host-guest complexation between two crown ether-based cryptands and two vinylogous viologens has been studied. Formation of [2]pseudorotaxanes from a dibenzo-24-crown-8-based cryptand and these vinylogous viologens can be reversibly controlled by adding and removing potassium cation in acetone. Furthermore, the complexation between a bis(m-phenylene)-32-crown-10-based cryptand and a vinylogous viologen exhibits a high association constant, 1.18 × 10(6) M(-1) in acetone, and leads to the formation of a supramolecular poly[2]pseudorotaxane in the solid state.
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