Light‐Induced Cyclization of A [c2]Daisy‐Chain Rotaxane to Form a Shrinkable Double‐Lasso Macrocycle

Si‐Jia Rao; Xu‐Hao Ye; Qi Zhang; Chuan Gao; Wen‐Zhi Wang; Da‐Hui Qu

Index: 10.1002/ajoc.201800114

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Abstract

A pH‐responsive double‐lasso macrocycle has been successfully obtained directly from a [c2]daisy chain rotaxane via a photodimerization reaction of two terminal coumarin ligands. The size of the double‐lasso macrocycle could be tuned by acid/base stimuli with the reversible muscle‐like extension/contraction of the [c2]daisy chain unit.