Supramolecular multicolor fluorescent hydrogels with a single fluorescent group based on host-guest interactions

Herein, a new type of supramolecular cross-linker was successfully constructed through host-guest interactions between the cationic pillar[5]arene and a sulfonate-functionalized acrylate, leading to the formation of a supramolecular polymeric hydrogel using photopolymerization of acrylamide, acrylic acid and twisted intramolecular charge transfer fluorescent moieties. This obtained hydrogel is a novel multicolor fluorescent functional hydrogel integrating pH-responsiveness, self-healing, electrical conductivity, and stretchability. Moreover, this hydrogel can effectively detect iron ions (Fe³⁺) through fluorescence.