Abstract
A novel coumarin based fluorescence anion chemosensor (P-1) bearing pyrazolone as a receptoric part was synthesized and characterized by using FT-IR, 1H/13C NMR and HRMS for the purpose of recognition of anions in DMSO. P-1 has four tautomeric structures and the most stable tautomeric form of P-1 was determined experimentally and theoretically. The chemosensor P-1 consists two receptoric parts as free amide NH and enamine NH which is stabilized intramolecular H-bonding with coumarin carbonyl oxygen. P-1 interacts selectively with fluoride anion via amide NH. The selectivity and sensitivity of probe to various anions were determined with spectrophotometric and 1H NMR titration techniques as experimentally and all results were also explained by theoretical calculations.
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