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Benzothiazole‐Based Sensors for Protons and Chromium(III) ions
Author(s) -
Sravani Chinduluri,
Sivaramakrishna Akella
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700820
Subject(s) - benzothiazole , protonation , chemistry , moiety , intramolecular force , ion , substituent , schiff base , amine gas treating , photochemistry , electron transfer , stereochemistry , organic chemistry
Two 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.