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Issue 29, 2015
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A reversible fluorescent-colorimetric imino-pyridyl bis-Schiff base sensor for expeditious detection of Al3+ and HSO3 in aqueous media

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Abstract

A reversible fluorescent-colorimetric imino-pyridyl bis-Schiff base receptor L(N1E,N4E)-N1,N4-bis(pyridine-4-ylmethylene)benzene-1,4-diamine for the detection of both Al3+ and HSO3 in aqueous medium has been developed. Receptor L exhibits an excellent selective fluorescent-colorimetric response toward Al3+. The sensitivity of the fluorescent based assay (0.903 μM) for Al3+ is far below the limit recommended in the World Health Organization (WHO) guidelines for drinking water (7.41 μM). From 1H NMR data, the Job plot and the ESI-MS spectrum, 1 : 2 stoichiometric complexation between L and Al3+ has been established. Receptor L shows remarkable detection ability in a wide pH range of 4–11 and was successfully utilised in the determination of Al3+ in aqueous solution of bovine serum albumin protein, and of HSO3 in real food samples. Moreover, L shows a highly selective colorimetric response to HSO3 by changing its colour from yellow to colorless immediately without any interference from other anions.

Graphical abstract: A reversible fluorescent-colorimetric imino-pyridyl bis-Schiff base sensor for expeditious detection of Al3+ and HSO3− in aqueous media

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Supplementary files

Article information


Submitted
13 Apr 2015
Accepted
15 Jun 2015
First published
16 Jun 2015

Dalton Trans., 2015,44, 13261-13271
Article type
Paper
Author version available

A reversible fluorescent-colorimetric imino-pyridyl bis-Schiff base sensor for expeditious detection of Al3+ and HSO3 in aqueous media

A. Ghorai, J. Mondal, R. Chandra and G. K. Patra, Dalton Trans., 2015, 44, 13261
DOI: 10.1039/C5DT01376C

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