Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 222, Issue -, Pages 823-828Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.08.090
Keywords
Colorimetric; Fluorescent; Coumarin based; F- sensor; ON1-OFF-ON2; fluorescent
Funding
- DST-SERB
- IIT KGP
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New, simple and inexpensive receptors based on coumarin-thiocarbohydrazone (CTC) and coumarin-carbohydrazone (CC) were synthesized for fluoride ion in CH3CN/DMSO. Receptor CTC showed specific selectivity and sensitivity toward fluoride giving rise to an ON1-OFF-ON2 fluorescent response and visual colorimetric change. The recognition mechanism was investigated using UV-vis, fluorescence spectroscopy, and H-1 NMR titration experiments. The Job's plot analysis and Benesi-Hildebrand equation revealed that the binding between the CTC or CC with F- is in 1:1 stoichiometry. Formation of such 1:1 complex led to the quenching of green fluorescence of CTC and upon excess addition of the [CTC-F-1] complex underwent an intracomplex proton transfer from N-H fragment of the host (CTC) to the anion producing a distinctly emissive (cyan colored fluorescence) receptor [CTC](2-). (C) 2015 Elsevier B.V. All rights reserved.
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