We developed new cationic fluorescent polymeric thermometers containing both benzothiadiazole and BODIPY units as an environment-sensitive fluorophore and as a reference fluorophore, respectively. The temperature-dependent fluorescence spectra of the thermometers enabled us to perform highly sensitive and practical ratiometric temperature sensing inside living mammalian cells. Intracellular temperatures of non-adherent MOLT-4 (human acute lymphoblastic leukaemia) and adherent HEK293T (human embryonic kidney) cells could be monitored with high temperature resolutions (0.01-1.0 degrees C) using the new cationic fluorescent polymeric thermometer.
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