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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ABSTRACT

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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ARTICLE INFORMATION

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. https://doi.org/10.6703/IJASE.202312_20(4).010

  Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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