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Simple and efficient coumarin-based colorimetric and fluorescent chemosensor for F− detection: An ON1–OFF–ON2 fluorescent assay

Publication Type : Journal Article

Publisher : Elsevier

Source : Sensors and Actuators B: Chemical

Url : https://www.sciencedirect.com/science/article/pii/S0925400515302689

Campus : Amritapuri

School : School of Physical Sciences

Department : Chemistry

Year : 2016

Abstract : 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 1H 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 F−, the [CTC–F−] complex underwent an intracomplex proton transfer from Nsingle bondH fragment of the host (CTC) to the anion producing a distinctly emissive (cyan colored fluorescence) receptor [CTC]2−.

Cite this Research Publication : Sandipan Biswas, Moumita Gangopadhyay, Shrabani Barman, Jit Sarkar, N. D. Pradeep Singh. Simple and efficient coumarin-based colorimetric and fluorescent chemosensor for F- detection: An ON1-OFF-ON2 fluorescent assay. Sensors and Actuators B: Chemical 2016, 222, 823-828. [DoI: 10.1016/j.snb.2015.08.090]

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