Pyrene functionalized oxacalix[4]arene architecture as dual readout sensor for expeditious recognition of cyanide anion

• Published in: Journal of fluorescence 2022-07, Vol.32 (4), p.1425-1433
• Main Authors: Panjwani, Falak, Dey, Shuvankar, Kongor, Anita, Kumar, Anshu, Panchal, Manthan, Modi, Krunal, Vora, Manoj, kumar, Ashu, Jain, Vinod Kumar
• Format: Article
• Language: English
• Subjects: Absorption spectra; Analytical Chemistry; Anions; Biochemistry; Biological and Medical Physics; Biomedical and Life Sciences; Biomedicine; Biophysics; Biotechnology; Color; Doppler effect; Fluorescent indicators; NMR; Nuclear magnetic resonance; Original Article; Recognition; Red shift; Selectivity; Silver; Titration
• ISSN: 1053-0509; 1573-4994
• DOI: 10.1007/s10895-022-02924-3

A pyrene functionalized oxacalix[4]arene architecture (DPOC) was utilized as a fluorescence probe for selective recognition of cyanide ions. The receptor DPOC shows excellent selectivity towards cyanide ion with a red shift of 108 nm in absorption band along with a significant change in colour from light yellow to pink. The fluorescence titration experiments further confirm the lower limit of detection as 1.7µM with no significant influences of competing anions. 1  H-NMR titration experiments support the deprotonation phenomena, as the -NH proton disappears upon successive addition of cyanide ions. The DFT calculation also indicates a certain increment of -NH bond length upon interaction with cyanide ions. The spectral properties as well as colour of DPOC-CN − system may be reversed upon the addition of Ag + / Cu 2+ ions up to 5 consecutive cycles. Moreover, DPOC coated “test strips” were prepared for visual detection of cyanide ions.