Abstract
Described in this article the design and synthesis of a simple fluorogenic and chromogenic chemodosimeter C for sensitive and selective detection of sulphite via the 1,4-Michael addition reaction. This chemodosimeter demonstrated high SO32− selectivity over other twenty-three competitive analytes in ∼100 % aqueous solution. Chemodosimeter C revealed a 35-fold “turn-on” fluorescence enhancement towards sulphite ions, as well as fluorometric color change from colorless to cyan. The chemodosimeters’ detection limit for sulphite ions was determined to be 0.782 µM. The sensing mechanism was established using 1H NMR titration, HRMS, and theoretical calculations. Additionally, convenient chemodosimeter C-based test strips and C-treated silica gel were developed for rapid on-site visual detection of sulphite ions.
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