A Novel Colorimetric and Fluorometric Dual-Channel Chemosensor based on A Conjugated Perylene-Benzothiazole System...

A novel cyanine compound based on the conjugated perylene-benzothiazole system (PBI) as a colorimetric and fluorometric dual-channel sensor for cyanide (CN^- ) detection was synthesized and characterized via UV-vis and fluorescence spectroscopy. PBI exhibited a high sensitivity and rapid optical response for CN^- due to the intramolecular charge transfer (ICT) mechanism. The detection limit of PBI for CN^- was 1.15×10^-7  M in the mixture of DMSO/H₂ O (1 : 1, v/v). Moreover, probe PBI demonstrated high selectivity and sensitivity for CN^- over other common anions, including Cl^- , Br^- , F^- , I^- , AcO^- , ClO₄ ^- , HSO₄ ^- , SO₄ ^2- , NO₂ ^- , NO₃ ^- and SCN^- . This work provided a simple and effective approach to trace the toxic CN^- ion with rapid response, high selectivity, and sensitivity that is possibly applied in environmental control and agricultural management.