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.

中文翻译：

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[c2]雏菊链轮烷的光诱导环化形成可收缩的双套索大环化合物

通过两个末端香豆素配体的光二聚反应，已经成功地从[ c 2]菊花链轮烷中成功获得了pH响应的双套索大环化合物。双套索大环的大小可以通过酸/碱刺激与[ c 2]菊花链单元可逆的类似肌肉的伸展/收缩来调节。