BowtieArene: A Dual Macrocycle Exhibiting Stimuli‐Responsive Fluorescence

다국어 초록 (Multilingual Abstract)

Although highly useful in supramolecular chemistry, pillararenes lack a fluorophore in their skeleton. Here we present BowtieArene, a novel fluorescent dual macrocycle, featuring a central tetraphenylethylene‐derived fluorophore and two pillar‐like, pentagon‐shaped cavities which are comparable to pillar[5]arene. This concisely prepared, figure‐of‐eight molecule exhibits vapor absorption and host–guest capabilities, as well as intriguing switchable fluorescence. The fluorochromism of BowtieArene can be triggered by multiple external stimuli including solvent, vapor, and mechanical force, with excellent reversibility and stability. Experimental and theoretical evidence indicate that the fluorochromism should be closely related to molecular packing.
Colorful bowtie: The novel fluorescent dual macrocycle BowtieArene features a central tetraphenylethylene‐derived fluorophore, double pillar‐like cavities, and solvent‐, vapor‐, and mechano‐induced fluorochromism. The switchable fluorescence is closely related to changes in the molecular packing mode.