Abstract
AbstractA poly(acrylic acid)‐based polymer gel exhibiting strong fluorescence and high photoresponsibility is prepared by using a cyanostilbene derivative as a self‐assembling supramolecular crosslinking agent, which generates conceptually new multiple hydrogen bonds in the gel system. This polymer gel in ethanol shows the gel‐to‐sol transition upon UV light irradiation with concomitant fluorescence color and intensity changes, which are attributed to the trans‐to‐cis photoisomerization of the supramolecular crosslinkers. Aggregation‐induced enhanced emission (AIEE) behavior of the trans‐cyanostilbene derivative enables a highly fluorescent polymer gel (ΦF = 0.68) with green color (λem = 541 nm), which can be switched into a blue fluorescent sol (λem = 506 nm and ΦF = 0.12) upon UV irradiation.
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