Temperature-driven on/off fluorescent indicator of pH window: an anthracene-conjugated thermoresponsive polymer

A simple copolymer, poly(NIPAM-co-N_AN), consisting of N-isopropylacrylamide (NIPAM) and 9-aminomethylanthracene (N_AN) units behaves as a temperature-driven on/off fluorescence indicator of pH window (2-12): showing an 'on-off' fluorescence intensity profile against the pH window at 15 °C, while showing an 'off-on-off' profile at 34 °C.