Journal
HETEROCYCLIC COMMUNICATIONS
Volume 26, Issue 1, Pages 123-129Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/hc-2020-0104
Keywords
Isatin; thiosemicarbazone; chromogenic sensor; fluoride ions; UV-Vis titrations; detection; DFT calculation
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Funding
- World Academy of Sciences (TWAS) [13-419 RG/PHA/AS_CUNESCO FR: 3240279216]
- Quaid-i-Azam University
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In this study, we describe the anion recognition ability of isatin-3-thiosemicarbazone 2, which contains two different anion recognition units i.e. isatin NH and the thiourea moiety. Both have the ability to act as proton donors. Most importantly, a significant colour change of 2 was observed (from light yellow to reddish orange) in organic medium only after the addition of the F- anion. No such colour change could be observed for any other anions including Cl-, Br-, I-, H2PO4-, NO2-, PF4- etc. The UV-Vis spectroscopic studies also indicate the potential of this compound for selective detection of fluoride anions. H-1-NMR titrations clearly indicate the formation of the 2.F- anionic complex. The Density-functional theory (DFT) calculations are also performed to get further insights on the formation of 2.F- complex.
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