A new highly emissive pH-responsive near-IR active digital probe was designed and synthesized. The probe is based on a bisbenzothiazole motif with a highly vulnerable hydrogen unit attached in an intramolecular fashion. The probe produced a large Stokes shift which was observed to be highly pH dependent. The optical pH dependence can be used for sensing pH over a wide range.

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http://dx.doi.org/10.1039/d3ay01702hDOI Listing

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