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Issue 20, 2018
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A fluorescent colorimetric azo dye based chemosensor for detection of S2− in perfect aqueous solution and its application in real sample analysis and building a molecular logic gate

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Abstract

A simple azo-dye based bis-Schiff base chemosensor, L, has been designed, synthesized and characterized by NMR and IR spectroscopy, ESI-MS and elemental analysis. The chemosensor L can successfully detect sulfide ions both visually and spectro-photometrically in perfect aqueous medium as well as in an organic–aqueous mixture through a de-protonation mechanism. The detection limit reaches 16 μM in pure aqueous medium (1.7 μM by UV-vis titration and 3.35 × 10−7 M by fluorescence titration in a 1 : 1 DMSO–H2O mixture), which is the lowest detection limit ever reported in the family of Schiff base chemosensors for sulfide ions. Other interfering anions (F, Cl, Br, HSO3, N3, PO43−, NO3, OAc, CO32− and CN) exhibited no interference for the detection of sulfide ions. The mechanism of interaction between L and sulphide ions has further been confirmed by DFT studies. The chemosensor L has also been applied for real sample analysis and in building a molecular logic gate.

Graphical abstract: A fluorescent colorimetric azo dye based chemosensor for detection of S2− in perfect aqueous solution and its application in real sample analysis and building a molecular logic gate

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Publication details

The article was received on 04 Mar 2018, accepted on 09 Apr 2018 and first published on 09 Apr 2018


Article type: Paper
DOI: 10.1039/C8AY00470F
Citation: Anal. Methods, 2018,10, 2317-2326
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    A fluorescent colorimetric azo dye based chemosensor for detection of S2− in perfect aqueous solution and its application in real sample analysis and building a molecular logic gate

    A. K. Manna, J. Mondal, R. Chandra, K. Rout and G. K. Patra, Anal. Methods, 2018, 10, 2317
    DOI: 10.1039/C8AY00470F

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