Abstract
AbstractTwo benzothiazole based Schiff bases 5‐(diethylamino)‐2‐(((6‐methoxybenzo[d]thiazol‐2‐yl)imino)methyl)phenol (probe 1) and N‐(4‐(dimethylamino)benzylidene)‐6‐methoxybenzo[d]thiazol‐2‐amine (probe 2) were efficiently synthesized and structurally characterized. Molecular structure of probe 1 is obtained by single crystal X‐ray analysis. The presence of hydroxyl substituent on phenyl moiety makes probe 1 as ESIPT (Excited State Intramolecular Proton Transfer) probe and the absence of hydroxyl on phenyl moiety differs probe 2 as PET (Photo Induced Electron Transfer) probe towards sensing of H+ ions. Probe 1 selectively detects H+ ions colorimetrically with reversible changes on adding a base like TEA. Besides H+ ions, probe 2 detects Cr(III) ions with a colorimetric response. The addition of TEA leads to reversible changes with primary protonation and these changes were irreversible with second protonation.
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