Issue 22, 2013

Highly selective fluorogenic anion chemosensors: naked-eye detection of F and AcO ions in natural water using a test strip

Abstract

Two new chemosensors S1 and S2 were synthesized and their chromogenic and fluorogenic behavior towards various biologically important anions in a competing solvent DMSO was investigated. Both the sensors portrayed a substantial color change upon addition of F and AcO ions and no significant change was observed on addition of other anions such as Cl, Br, I, ClO4 and HSO4. The binding constant showed that both F and AcO anions bind to the sensors in an equal proportion, in which S2 was found to be superior and showed a better binding ability than S1. Job's plots indicated that both sensors formed a (1 : 1) complex (sensor : anion) with F and AcO anions. Remarkable fluorescence “turn on” emission behavior was observed with both the sensors when treated with F and AcO anions respectively. 1H NMR titration experiments indicated that both S1 and S2 formed a strong hydrogen bond not only with the phenolic-OH but also with the amide-NH of the triazole. We have also demonstrated an easy-to-prepare test strip of S2 to detect F and AcO anions even in aqueous medium at a lower limit of about 10 ppm, indicating the potential real-life application of detecting F and AcO anions in a natural aqueous environment simply through naked-eye observation.

Graphical abstract: Highly selective fluorogenic anion chemosensors: naked-eye detection of F− and AcO− ions in natural water using a test strip

Supplementary files

Article information

Article type
Paper
Submitted
25 Apr 2013
Accepted
30 Aug 2013
First published
02 Sep 2013

Anal. Methods, 2013,5, 6401-6410

Highly selective fluorogenic anion chemosensors: naked-eye detection of F and AcO ions in natural water using a test strip

M. Saravana Kumar, S. L. Ashok Kumar and A. Sreekanth, Anal. Methods, 2013, 5, 6401 DOI: 10.1039/C3AY40686E

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