Pyrene functionalized oxacalix[4]arene architecture as dual readout sensor for expeditious recognition of cyanide anion |
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Authors: | Panjwani Falak Dey Shuvankar Kongor Anita Kumar Anshu Panchal Manthan Modi Krunal Vora Manoj kumar Ashu Jain Vinod Kumar |
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Institution: | 1.Department of Chemistry, School of Sciences, Gujarat University, 380009, Ahmedabad, Gujarat, India ;2.Faculty of Science, Department of Chemistry, Ganpat University, Kherva Mehsana, Gujarat, India ; |
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Abstract: | A pyrene functionalized oxacalix4]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+/ Cu2+ ions up to 5 consecutive cycles. Moreover, DPOC coated “test strips” were prepared for visual detection of cyanide ions. |
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