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Colorimetric and Fluorometric Turn-on Sensor for Selective Detection of Fluoride Ion: Sol-Gel Transition Studies and Theoretical Insights

Abstract

A new organic receptor R1 based on naphthyl unit covalently linked to a long alkyl chain has been designed, synthesized and characterized by standard spectroscopic techniques. Colorimetric response of receptor R1 from colorless to pale yellow color and fluorescent blue emission in the presence of F¯ ions revealed the selective sensing ability in solution phase. UV-Vis titration, fluorescence titration and 1H NMR titration studies confirmed the formation of 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 solution which exhibited fluorescent blue emission. Binding constant of R1- F¯ complex was found to be of the order 5.9 105 M-1. DFT studies revealed the formation of receptor-anion complex corroborating well with the experimental results. Detection limit has been calculated and found to be 0.8 ppm implying the application of receptor R1 in environmental applications.

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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, Accepted Manuscript
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    Colorimetric and Fluorometric Turn-on Sensor for Selective Detection of Fluoride Ion: Sol-Gel Transition Studies and Theoretical Insights

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

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