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Two rosamine‐based pH probes 1a and 1b with pyronine‐phenol skeleton were designed and synthesized by a simple one‐step reaction. pH titration experiments showed that probes 1a and 1b exhibit near OFF–ON fluorescence responses around 550–750 nm towards the hydrogen ions. The pKa of the probe 1a is 8.29, while that of the probe 1b increases to 12.1 because of the hydrogen bond inside it. Selective...
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