Journal
ROYAL SOCIETY OPEN SCIENCE
Volume 5, Issue 7, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsos.180646
Keywords
acridine; thiosemicarbazldes; fluoride (F-); UV absorption; fluorescence; density functional theory calculations
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Funding
- ICCBS-TWAS
- Higher Education Commission (HEC), Pakistan [4732, 5743]
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New thiosemicarbazide-linked acridine 3a-c were prepared and investigated as chemosensors for the detection of biologically and environmentally important anions. The compounds 3a-c were found selective for fluoride (F-) with no affinity for other anions, i.e. -OAc, Br-, I-,HSO4-, SO42-, PO4 circle-, ClO3-, CIO4-, CN- and SCN-. Further, upon the gradual addition of a fluoride anion (F-) source (tetrabutylammonium fluoride), a well-defined change in colour of the solution of probes 3a-c was observed. The anion-sensing process was studied in detail via UV-visible absorption, fluorescence and H-1-NMR experiments. Moreover, during the synthesis of acridine probes 3a-c nickel fluoride (NiF2), a rarely explored transition metal fluoride salt, was used as the catalyst. Theoretical studies via density functional theory were also carried out to further investigate the sensing and anion (F-) selectivity pattern of these probes.
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