Experimental and theoretical studies for the recognition of multiple anions (Cyanide and Sulfide) Based on a thiazole-derived chemosensor

A new colorimetric chemosensor 1 (E)-2-(((4-(p-Tolyl)thiazol-2-yl)imino)methyl)phenol for the detection of both CN-And S^2- has been developed. The receptor 1 showed selective colorimetric responses to CN-And S^2- in aqueous solution. A clear color change of 1 from pale yellow to colorless was observed with CN-Through a nucleophilic addition mechanism, while S^2- was detected through deprotonation mechanism with a distinct color change from pale yellow to deep yellow. The binding modes of receptor 1 with two analytes (CN-And S^2-) were proposed to be 1:1, based on Job plot, 1H NMR titration, ESI-mass spectrometry analysis, and theoretical calculations. Moreover, the receptor 1 could be used to quantify CN- in water samples. Furthermore, 1 could be used as practical, visible colorimetric test kits for S^2- in an aqueous environment.