Abstract
A Schiff base fluorescent “turn-off” sensor L based on 2, 4-diamino-6-hydroxypyrimidine, and 2-hydroxy-1-naphthaldehyde was synthesized, which shows excellent selectivity and sensitivity towards Cu2+ ions in an aqueous medium. The detection limit of the probe was found to be 11.92 µM which is much lower than the acceptable level of Cu2+ ions in drinking water as set by the World Health Organization (30 µM) and the U. S. Environmental Protection Agency (20 µM). Furthermore, a 1: 0.5 binding stoichiometry between the probe and Cu2+ ion was confirmed from the fluorescence titration data, Job’s plot, and DFT calculation. The binding constant (Ka) of Cu2+ ion with the probe was found to be 6.3 × 104 M−1. Thus, the overall study reveals that the synthesized Schiff base ligand is a potential fluorescent sensor for Cu2+ions.
Graphical abstract
The research study includes the synthesis of a novel and efficient Schiff base ligand L, which is highly sensitive and a selective fluorescent sensor for Cu2+ ions with a very low detection limit.
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The Authors are thankful to the Department of Science and Technology, Govt. of India, and the Director of the Institute of Advanced Study in Science and Technology.
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Bhaswati Devi: Conceived the idea of sensing Cu2+ ions in water by a synthetically prepared Schiff base fluorescent sensor, which is also feasible as a potential antibacterial agent, data analysis, and manuscript preparation. Dr. Ankur Kanti Guha: Performed the DFT calculation study and manuscript preparation. Chandana Malakar: Manuscript preparation. Dr. Arundhuti Devi: Supervision and manuscript preparation.
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Devi, B., Guha, A.K., Malakar, C. et al. Synthesis, characterization, Density Functional Theory (DFT) calculation, and fluorescent study of an efficient and novel Schiff base Cu(II) sensor. J Chem Sci 134, 88 (2022). https://doi.org/10.1007/s12039-022-02083-9
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DOI: https://doi.org/10.1007/s12039-022-02083-9