A pyrene-functionalized dual responsive [2]catenane switch is reported. The [2]catenane possesses a photophysical output that is correlated to its co-conformational changes, which can be fine-tuned by the combination of two orthogonal stimuli: cation binding and solvent polarity. Specifically, the cation binding is employed to “lock” the mechanical bond to prevent the pyrenes from approaching each other, while increasing the solvent polarity will strengthen the intramolecular pyrene-pyrene hydrophobic interactions such that the pyrenes will be brought closer in proximity. This work demonstrates the dual-responsive and fine-tunable properties of a [2]catenane switch which allow an elaborate and versatile control.  

Fine-Tuning of the Optical Output in a Dual-Responsive Catenane Switch

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