International Journal of Applied Science and Engineering
Published by Chaoyang University of Technology

Keerthika Kumarasamy 1, Tamiloli Devendhiran 2, Wei-Jyun Chien 1, Mei-Ching Lin 1, Selva Kumar Ramasamy 3, Chih-Jung Chen 1, Jui-Chang Tseng 1*

1 Department of Applied Chemistry, Chaoyang University of Technology, Taichung, 413310, Taiwan (R.O.C)

2 Department of Chemistry, National Changhua University of Education, Changhua, 500, Taiwan (R.O.C)

3 Department of Chemistry, Maharishi Markandeshwar Engineering College, Maharishi Markandeshwar (Deemed to be) University, Ambala, 133207, Haryana, India


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A series of chemical-sensors, benzimidazole-coumarin (M1, M2 & M3), were synthesized and characterized by 1H NMR, mass spectrometry, and elementary analysis. UV-Vis absorption and emission spectrometer investigated the fluorescent behavior and recognition mechanism of these sensors. The absorption and emission bands of sensor M derivatives were found at 310 to 350 and 390 to 580 nm. The sensor M derivative exhibits a “turn-off fluorescent quenching and selective complexing capacity towards Cu2+ ions. The detection limit of sensor M1 is 3.9 nM for Cu2+ ions, and the coordination ratio was found to be 2:1 ratio by the Job’s plot method. The binding constant was also calculated to be Ks 3.41 × 109 /M2. The fluorescence quenching seen in M-Cu2+ has been attributed to a lower HOMO-LUMO orbital gap and decreased electron donation from the coordinated imidazolyl coumarin, as found by DFT calculations. The sensor M2 was successfully applied to detect Cu2+ in the different water samples. A stable complex of sensor M-Cu2+ was characterized by the Job’s plot method, ESI-MS and DFT studies.

Keywords: Metal ion sensor, Benzimidazole, Cu2+ sensing, Coumarin, DFT calculations, EDTA.

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Received: 2023-07-14
Revised: 2023-09-05
Accepted: 2023-10-20
Available Online: 2023-12-01

Cite this article:

Kumarasamy, K., Devendhiran, T., Chien, W.-J., Lin, M.-C., Ramasamy, S.K., Chen, C.-J., Tseng, J.-C. 2023. Metal recognition behaviour study of coumarin containing benzimidazole moiety. International Journal of Applied Science and Engineering, 20, 2023227.

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