Abstract
A benzoxazole-based fluorescent chemosensor (OPMP) has been designed, synthesized, and characterized by various analytical techniques. The as-prepared OPMP is employed for the cascade detection of Zn2+ and PO43- ions, respectively, based on the ‘off–on-off’ photoluminescence mechanism in 30% (v/v) water-DMSO mixture. A significant fluorescence enhancement of OPMP at 495 nm is observed due to chelation-enhanced fluorescence upon binding with Zn2+ ions. A visual bluish-green color could be seen under 365 nm UV light irradiation, which is also well supported by the color chromaticity diagram. The fluorescence of the Zn2+chelated OPMP complex is quenched in the presence of PO43- ions. The sensitivity of OPMP and Zn2+chelated OPMP complex towards detection of Zn2+ and PO43- ions can be possible down to 38 nM and 48 nM, respectively. Such as dual ions detection system with outstanding reversibility and reproducibility led us to consider our OPMP as a feasible candidate for the construction of molecular logic circuits, molecular keypad locks, and set-reset memorized molecular devices. Further, an OPMP staining paper strips-based test kit has been fabricated and demonstrated for the sequential detection of Zn2+ and PO43- ions, respectively.
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