A simple and coast effective quinoline based Schiff’s base SS-2 as a colorimetric chemosensor for highly selective detection of cyanide ion in food samples

Abstract

A simple, cost-effective, and highly selective colorimetric chemosensor was designed and synthesized (E)-2-(4-chlorophenoxy)-3-((2-(4-nitrophenyl) hydrazono) methyl) quinoline SS-2 from 2-(4-Chlorophenoxy) quinolin-3-carbaldehyde and 4-Nitrophenylhydrazine and confirmed by spectral techniques. The receptor SS-2 was found to exhibit a colorimetric response of the colour change from yellow to blue towards CN− ion, due to de-protonation and intra-ligand charge transfer. The receptor SS-2 interacts with cyanide in a 1:1 stoichiometric manner with a detection limit of 5.39 × 10−7 M. Receptor SS-2 could be recyclable by treatment of Tri fluoro acetic acid. The sensing behaviour of the receptor was further enunciated by computational studies and found to efficiently detect even the trace amounts of cyanide present in food samples such as flax seeds, apple seeds, kidney beans, sprout potatoes, and almond skin. In further SS-2 can be used for practical applications like visible colorimetric test kits such as dipsticks.