Excimer-containing polymers with supramolecular mechanochromism are an attractive
and well-investigated class of mechanoresponsive materials. However, only recently
steps toward mechanophore-like mechanochromic systems that are anchored within the
parent polymer structure and that show defined optical transitions on the molecular
scale have been reported. However, the multi-step syntheses of these constructs are
tedious. Here we report the development of a series of pyrene-based macrocrosslinkers
that display supramolecular mechanochromism and are readily synthesized from mostly
commercial reagents. We incorporate the water-soluble macrocrosslinkers in hydrogel
networks and demonstrate their reversible mechanochromic behavior in the elastic deformation
regime.
Key words
mechanochemistry - mechanochromism - hydrogels