Abstract
In this study, the Schiff base (probe 1) was designed and synthesized, using the moieties of benzothiazole and salicylaldehyde as signaling units. UV–visible and emission spectroscopy has been identified to study interaction of probe 1 with various anions. Absorption bands at 290 and 360 nm for probe 1 (20 µM; CH3CN) were observed and two fluorescence peaks at 415 and 540 nm obtained with excitation at 360 nm in CH3CN. Probe 1 (20 µM) developed a yellow color in presence of F− and P2O74− ions in their tetrabutylammonium salts. For both the ions, the corresponding absorption measurements revealed bathochromic shift of 85 nm. When complexed with anions, emission changes show that probe 1 acts as a “turn-on” sensor. Probe 1 shows detection limit (LOD) of 35.4 and 15.4 nM for F− and P2O74−, respectively. 1H NMR titration analyses revealed more about their mode of binding with probe 1.
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