Abstract
A benzoxazole-coumarin-based probe BOC, was synthesized and validated for its anion sensing ability and found to be effective in recognizing cyanide ions. Upon addition of cyanide, a spontaneous color change was observed that was visible to the naked eye. The sensitization process takes place with nucleophilic addition, and the cyanide ion added to the probe disrupts the intra molecular charge transfer transition (ICT) between the donor and acceptor units, causing the pink colored probe to become yellow. Ultraviolet and fluorescence methods were applied to measure the detection limits of probes with added cyanide ions, which were found to be 3.47 µM and 2.48 nM. The stoichiometry of the probe with the cyanide ion was determined by the Job’s method, NMR titration, and mass spectrometry and was found to be in a 1:1 ratio. The results obtained from the visual and UV-visible spectral studies are justified by theoretical calculations. The cyanide-loaded probe induced visual changes, which enabled the development of a test strip for field application, and the prepared strip can be used to detect the ppm level of cyanide in water samples. The developed probe, BOC, can be used to detect cyanide ions in various water samples.
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The authors extend their appreciation to the Researchers supporting project number (RSP2024R465) King Saud University, Riyadh, Saudi Arabia.
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The authors extend their appreciation to the Researchers supporting project number (RSP2024R465) King Saud University, Riyadh, Saudi Arabia.
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Jayasudha Palanisamy: Methodology, Investigation, Formal analysis, Visualization, Writing - original draft.Rajakrishnan Rajagopal: Investigation, Writing - review & editing.Ahmed Alfarhan: Investigation, Writing - review & editing.
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Palanisamy, J., Rajagopal, R. & Alfarhan, A. Coumarin Linked Cyanine Dye for the Selective Detection of Cyanide Ion in Environmental Water Sample. J Fluoresc (2024). https://doi.org/10.1007/s10895-024-03620-0
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DOI: https://doi.org/10.1007/s10895-024-03620-0