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Sensors 2018, 18(7), 2219; https://doi.org/10.3390/s18072219

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

Department of Chemistry and Earth Sciences, Qatar University, Doha 2713, Qatar
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Received: 3 June 2018 / Revised: 1 July 2018 / Accepted: 5 July 2018 / Published: 10 July 2018
(This article belongs to the Section Chemical Sensors)
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Abstract

(E)-2-((benzo[d]thiazol-2-ylimino)methyl)-4-nitrophenol 1 and (E)-2-(((6-methoxybenzo[d]thiazol-2-yl)imino)methyl)-4-nitrophenol 2 were synthesized efficiently under microwave conditions. The structures were confirmed using IR, 1H NMR, and 13C NMR. UV-vis. Fluorescence investigations demonstrated that 1 and 2 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 1 and 2, respectively. It enhances the absorption at wavelengths 385 nm and 425 nm of 1 and 385 nm and 435 nm of 2. Acidic anions H2PO4 and H2AsO4 displayed significant interference with the interaction of cyanide and sensors 1 and 2. Sensor 1 has lower detection limit (LDL) 1 × 10−6 M, while 2 has LDL 1.35 × 10−6 M. View Full-Text
Keywords: 2-aminobenzothiazoles; cyanide; fluorescence; sensors; microwave assisted synthesis 2-aminobenzothiazoles; cyanide; fluorescence; sensors; microwave assisted synthesis
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Elsafy, A.G.; Al-Easa, H.S.; Hijji, Y.M. Substituted 2-Aminobenzothiazoles Salicylidenes Synthesis and Characterization as Cyanide Sensors in Aqueous Medium. Sensors 2018, 18, 2219.

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