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A ratiometric fluorescent pH probe 4-((1E, 3E)-4-(benzo[d]thiazol-2-yl)buta-1, 3-dienyl)-N, N-dimethylbenzenamine (BTDB) was synthesized via ethylene bridging of thiazol and cinnamaldehyde for extremely acidic sensing. BTDB exhibits ratiometric fluorescence emission (I425nm/I595nm) characteristics with pKa of 2.34 and a large Stokes shift of 177nm under acidic conditions. The linear response to pH...
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