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Title: Imidazole and oxazole containing fluorescent dyad: Cu2+ induced fluorescence quenching and cyanide sensing “On-Off-On” via copper displacement approach
Authors: Misra, Arvind
Ali, Rashid
Keywords: Chemosensor;Cu2+;CN;Memory element
Issue Date: Feb-2018
Publisher: NISCAIR-CSIR, India
Abstract: A new simple organic molecule 4 containing imidazole and oxazole moiety has been synthesized and utilized for Cu2+ and cyanide sensing via displacement approach and fluorescence On-Off-On mechanism with rapid response in either of two sequential sensing events. The photophysical behavior of probe 4 toward different metal ions and anions has been examined through the absorption and fluorescence spectroscopy in HEPES buffer. Probe 4 shows high selectivity for Cu2+ with fluorescence quenching (~93%; switch-Off). The in situ generated ensemble, 4+Cu2+ upon interaction with different anions shows high selectivity for CN in which the fluorescence intensity revived (switched-On) due to the formation [Cu(CN)x]1−x species in the medium. Further, the naked eye sensitive “On-Off-On” sensing behavior of 4 has been utilized for construction of a sequential logic circuit at the molecular level. The FT-IR, 1H NMR and ESI-MS spectroscopy and DFT support the proposed mechanism of interaction.
Page(s): 217-228
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.57B(02) [February 2018]

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IJCB 57B(2) 217-228_Suppl Data.pdfSupplementary Data347.68 kBAdobe PDFView/Open

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