Bisthiocarbohydrazones as colorimetric and "turn on" fluorescent chemosensors for selective recognition of fluoride
Industrial and Engineering Chemistry Research, ISSN: 0888-5885, Vol: 50, Issue: 22, Page: 12379-12383
2011
- 33Citations
- 17Captures
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Article Description
Bisthiocarbohydrazone derivatives of two heterocyclic ketones were designed and synthesized to selectively sense fluoride ion from a biologically competing solvent dimethylsulfoxide (DMSO). The selective recognition of fluoride is clearly visible to the naked eye with a distinct color change. The recognition mechanism has been investigated by UV-visible, fluorescence spectroscopy, and H NMR titration experiments. From the Benesi-Hidebrand equation and Job's plot, it was inferred that both compounds bind to fluoride with a 1:1 stoichiometry. H NMR titration data indicates deprotonation of the NH protons by fluoride as a prominent step in the recognition. © 2011 American Chemical Society.
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