Novel synthesized azo-benzylidene-thiourea as dual naked-eye chemosensor for selective detection of Hg2+ and CN¯ ions

• Published in: Journal of photochemistry and photobiology. A, Chemistry. Vol. 391; p. 112365
• Main Authors: Hosseinjani-Pirdehi, Hamide, Mahmoodi, Nosrat O., Pasandideh Nadamani, Meysam, Taheri, Amir
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.03.2020
• Subjects: Colorimetric probe; Dual sensor; Ion sensing; Naked-eye detection; Dual sensor; Ion sensing; Colorimetric probe; Naked-eye detection
• ISSN: 1010-6030; 1873-2666
• DOI: 10.1016/j.jphotochem.2020.112365

[Display omitted] •Seven novel colorimetric chemosensor with azo chromophore and phenylthiourea was synthesized.•All synthesized chemosensors utilized as a dual functional colorimetric chemosensor in detection of CN¯ and Hg2+ ions.•The limit of detection of probe 3c calculated in micro molar (μM) stage for CN¯ and Hg2+ ions.•For easy detection of CN¯ and Hg2+ ions, the paper strips of probe 3c were prepared. Seven novel chemosensors contain azo chromophore and phenylthiourea, were synthesized and applied as colorimetric probes in aqueous solutions of dimethyl sulfoxide. The anion recognition studies exhibited that the synthesized azo dye derivatives act as a highly dual-sensitive and selective chromogenic sensor for naked-eye detection of Hg2+ and CN¯ ions, with a different color change from yellow to colorless and yellow to red, respectively. The limit of detection (LOD) was found for 3c toward Hg2+ and CN¯ ions to be 4.89 μM and 2.23 μM, respectively. The result of the Job's plot indicating that the stoichiometry binding ratios of compound 3c to Hg2+ is 1:1 and to CN¯ is 1:2. These results were confirmed by 1H NMR titration experiments.