Substituted 2-Aminobenzothiazoles Salicylidenes Synthesis and Characterization as Cyanide Sensors in Aqueous Medium

• Published in: Sensors (Basel, Switzerland) Vol. 18; no. 7; p. 2219
• Main Authors: Elsafy, Anas G, Al-Easa, Hala Sultan, Hijji, Yousef M
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 10.07.2018; MDPI
• Subjects: 2-aminobenzothiazoles; Aminobenzothiazoles; Anions; Colorimetry; cyanide; Cyanides; Fluorescence; microwave assisted synthesis; Nitrophenol; Sensors; cyanide; microwave assisted synthesis; sensors; fluorescence; 2-aminobenzothiazoles
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s18072219

(E)-2-((benzo[ ]thiazol-2-ylimino)methyl)-4-nitrophenol and (E)-2-(((6-methoxybenzo[ ]thiazol-2-yl)imino)methyl)-4-nitrophenol were synthesized efficiently under microwave conditions. The structures were confirmed using IR, ¹H NMR, and C NMR. UV-vis. Fluorescence investigations demonstrated that and are sensitive and selective sensors for detection of cyanide over all other anions SCN , AcO , N₃ , H₂PO₄ , H₂AsO₄ , F , Cl , Br , and I in aqueous media. Cyanide induces colorimetric change from pale yellow to dark yellow and from transparent to pale yellow for and respectively. It enhances the absorption at wavelengths 385 nm and 425 nm of and 385 nm and 435 nm of . Acidic anions H₂PO₄ and H₂AsO₄ displayed significant interference with the interaction of cyanide and sensors and . Sensor has lower detection limit (LDL) 1 × 10 M, while has LDL 1.35 × 10 M.