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Issue 12, 2018
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Colorimetric and fluorometric turn-on sensor for selective detection of fluoride ions: sol–gel transition studies and theoretical insights

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Abstract

A new organic receptor R1 based on a naphthyl unit covalently linked to a long alkyl chain has been designed, synthesized and characterized by standard spectroscopic techniques. The colorimetric response of receptor R1 from colorless to a pale yellow color and blue fluorescence emission in the presence of F ions revealed its selective sensing ability in the solution phase. UV-Vis titration, fluorescence titration and 1H NMR titration studies confirmed the formation of the R1–F complex. Receptor R1 formed a stable gel in DMSO and was confirmed through the standard heating-and-cooling method. Addition of F ions resulted in disruption of the gel forming a solution that exhibited blue fluorescence emission. The binding constant of the R1–F complex was found to be of the order of 5.9 × 105 M−1. DFT studies revealed the formation of the receptor–anion complex agreeing well with the experimental results. The detection limit was calculated and found to be 0.8 ppm, implying the potential for application of receptor R1 in environmental applications.

Graphical abstract: Colorimetric and fluorometric turn-on sensor for selective detection of fluoride ions: sol–gel transition studies and theoretical insights

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Publication details

The article was received on 28 Feb 2018, accepted on 03 May 2018 and first published on 08 May 2018


Article type: Paper
DOI: 10.1039/C8NJ00991K
Citation: New J. Chem., 2018,42, 10406-10413
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    Colorimetric and fluorometric turn-on sensor for selective detection of fluoride ions: sol–gel transition studies and theoretical insights

    S. Pangannaya, M. Mohan and D. R. Trivedi, New J. Chem., 2018, 42, 10406
    DOI: 10.1039/C8NJ00991K

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