Use of the fluorogenic Al3+–quinolinyl-azo-naphtholato complex for the determination of F− in aqueous medium by visible light excitation and application in ground water fluoride analysis. Issue 35 (27th August 2019)

• Record Type: Journal Article
• Authors: Sen, Chandana; Dey, Sunanda; Patra, Chiranjit; Mallick, Debashis; Sinha, Chittaranjan
• Is Part Of: Analytical methods. Volume 11:Issue 35(2019)
• Page Start: 4440
• Page End: 4449
• Publication Date: 2019-08-27
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c9ay01418g
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : Quinolinyl-azo-naphthol (HL) is a selective turn-on chemosensor for Al 3+ in the presence of other ions and the excitation at visible light (537 nm) shows a 750 fold enhancement of emission at 612 nm. Abstract : Quinolinyl-azo-naphthol (HL) is a selective turn-on chemosensor for Al 3+ in the presence of other ions and the excitation at visible light (537 nm) shows a 750 fold enhancement of emission at 612 nm. The limit of detection (LOD) is 0.69 nM (3σ method), which is far below the WHO recommended value for Al 3+ 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 the [AlL2 ] + solution the emission intensity is quenched and the LOD of F − is 0.63 nM. HL is thus instrumental for the design of portable kits for the detection of fluoride contamination in drinking water. The probe undergoes azo-hydrazo tautomerization and also exhibits an INHIBIT logic gate with Al 3+ and F − as chemical inputs by monitoring the emission mode at 612 nm.