Journal
RSC ADVANCES
Volume 6, Issue 93, Pages 90322-90330Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra19647k
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Funding
- DST, New Delhi [SR/FT/CS-46/2011]
- UGC New Delhi
- DST New Delhi under FIST grant
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Two chromofluorescent thiocarbonohydrazone receptors (4 and 5) functionalized with coumarin derivatives have been synthesized and evaluated for selective detection of fluoride ions. Receptor 4 selectively recognizes fluoride ions via H-bond interaction and subsequent deprotonation to elicit a distinct visual colour change from colourless to pink with a significant 20-fold enhancement in its emission intensity to turn on a blue fluorescent. In contrast, receptor 5 exhibited a visible colour change from colourless to deep red upon interaction with fluoride ions over other anions. Detailed analysis of the binding characteristics of these receptors with fluoride ions revealed a 1 : 1 binding stoichiometry at lower concentrations while higher concentrations led to a 1 : 2 binding stoichiometry between the receptor and fluoride ions. These experimental results were further corroborated with quantum chemical calculations.
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