A Novel Colorimetric and Fluorometric Dual‐Channel Chemosensor based on A Conjugated Perylene‐Benzothiazole System for Highly Selective Detection of Cyanide in Aqueous Media

• Published in: ChemPlusChem (Weinheim, Germany) Vol. 88; no. 8; pp. e202300264 - n/a
• Main Authors: Nguyen, Thao Phuong Le, Nguyen, Cam Hong Thi, Nguyen, Thiet‐Quoc, Tran, Chau Duc, Nguyen, Tam Huu, Nguyen, Le‐Thu T., Nguyen, Ha Tran
• Format: Journal Article
• Language: English
• Published: WEINHEIM Wiley 01.08.2023
• Subjects: Chemistry; Chemistry, Multidisciplinary; chemosensor; conjugated molecules; cyanide anion; intramolecular charge transfer mechanism; perylene; Physical Sciences; Science & Technology; ENSEMBLE; conjugated molecules; RECOGNITION; chemosensor; intramolecular charge transfer mechanism; SENSOR; ION; CHROMATOGRAPHY; perylene; FLUORESCENT; RATIOMETRIC DETECTION; cyanide anion; ICT; WATER; Chemosensor; Conjugated Molecules
• ISSN: 2192-6506; 2192-6506
• DOI: 10.1002/cplu.202300264

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/H2O (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−, SO42−, 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. A novel cyanide chemosensor (PBI) was synthesized from perylene and 3‐ethyl‐2‐methylbenzothiazolium iodide via Knoevenagel condensation reaction. The conjugated molecule is a naked‐eye detection with highly sensitive and selectivity for cyanide due to the intramolecular charge transfer (ICT) mechanism. The detection limit of PBI to cyanide anion is 1.15×10−7 M with the color change from red‐violet to yellow.