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Use of fluorogenic Al3+- Quinolinyl-azo-naphtholato complex for the determination of F− in aqueous medium by visible light excitation and application on ground water fluoride analysis

Abstract

Quinolinyl-azo-naphthol (HL) is a selective turn-on chemosensor to Al3+ in presence of other ions and the excitation at visible light (537 nm) shows 750 fold enhancement of emission at 612 nm. The limit of detection (LOD) is 0.69 nM (3 method), which is far below the WHO recommended value of Al3+ in drinking water (7.41 µM). The composition of the isolated complex [AlL2]+ is supported by ESI-MS spectral data and Job’s plot. Upon addition of aqueous F- to [AlL2]+ solution the emission intensity is quenched and LOD of F- is 0.63 nM. HL is thus instrumental for the designing of potable kits for the detection of fluoride contamination in drinking water. The probe undergoes azo-hydrazo tautomerization and also exhibits an INHIBIT logic gate with Al3+ and F− as chemical inputs by monitoring the emission mode at 612 nm.

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Publication details

The article was received on 04 Jul 2019, accepted on 07 Aug 2019 and first published on 07 Aug 2019


Article type: Paper
DOI: 10.1039/C9AY01418G
Anal. Methods, 2019, Accepted Manuscript

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    Use of fluorogenic Al3+- Quinolinyl-azo-naphtholato complex for the determination of F− in aqueous medium by visible light excitation and application on ground water fluoride analysis

    C. Sinha, C. Sen, S. Dey, C. Patra and D. Mallick, Anal. Methods, 2019, Accepted Manuscript , DOI: 10.1039/C9AY01418G

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