Indian Journal of Chemical Technology

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A Selective Indole Based Chemosensor for Fluoride Ion Detection


Affiliations
1 Department of Chemistry, CMR Institute of Technology, Bengaluru-560037, India
2 Department of Chemistry, Dinhata College, Cooch Behar-736135, West Bengal, India
3 Department of Chemistry, Guru Nanak First grade Science, Commerce and Post graduate College, Bidar-585403, Karnataka, India
4 School of Sciences, Malla Reddy University, Hyderabad, Telangana 500100, India
5 Centre of Excellence in Materials & Sensors, CMR Institute of Technology, Bengaluru-560037, India

The selective detection of anions via chemosensors have recently emerged as an important area of research due to their vital role in biological, chemical and environmental sciences. An efficient indole based chemosensor C1 exhibiting selective detection of fluoride ions has been synthesized by condensation reaction of substituted indole derived Carbohydrazide 1 with substituted ethenone 2 and characterized by 1H NMR and 13C NMR spectroscopy. Chemosensor shows notable colorimetric changes from light yellow to greenish yellow, upon addition of fluoride ions. The absorption studies shows red shift in the absorption spectra upon titration with fluoride ions. The receptor–anion interaction occurs through hydrogen bonding followed by deprotonation of –OH proton. Chemosensor shows 2:1 stoichiometry as calculated from the Job’s plot.

Keywords

Chemosensor, Colorimetric sensor, Fluoride detection, Indole, Schiff base condensation
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  • A Selective Indole Based Chemosensor for Fluoride Ion Detection

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Authors

Fazlur Rahaman
Department of Chemistry, CMR Institute of Technology, Bengaluru-560037, India
Subrata Mondal
Department of Chemistry, Dinhata College, Cooch Behar-736135, West Bengal, India
Nagesh G Y
Department of Chemistry, Guru Nanak First grade Science, Commerce and Post graduate College, Bidar-585403, Karnataka, India
A. Gautam
School of Sciences, Malla Reddy University, Hyderabad, Telangana 500100, India
Prabhat Gautam
Department of Chemistry, CMR Institute of Technology, Bengaluru-560037, India
Priti Gupta
Centre of Excellence in Materials & Sensors, CMR Institute of Technology, Bengaluru-560037, India

Abstract


The selective detection of anions via chemosensors have recently emerged as an important area of research due to their vital role in biological, chemical and environmental sciences. An efficient indole based chemosensor C1 exhibiting selective detection of fluoride ions has been synthesized by condensation reaction of substituted indole derived Carbohydrazide 1 with substituted ethenone 2 and characterized by 1H NMR and 13C NMR spectroscopy. Chemosensor shows notable colorimetric changes from light yellow to greenish yellow, upon addition of fluoride ions. The absorption studies shows red shift in the absorption spectra upon titration with fluoride ions. The receptor–anion interaction occurs through hydrogen bonding followed by deprotonation of –OH proton. Chemosensor shows 2:1 stoichiometry as calculated from the Job’s plot.

Keywords


Chemosensor, Colorimetric sensor, Fluoride detection, Indole, Schiff base condensation