A Benzimidazole-Based Fluorescent Probe for the Selective Recognition of Cobalt (II) Ions

A Benzimidazole-Based Fluorescent Probe for the Selective Recognition of Cobalt (II) Ions

Cobalt, a rare element in the Earth’s crust, is widely used in industries due to its hardness and antioxidant properties. It also plays a vital role in physiological functions, being a key component of vitamin B<sub>12</sub>. However, excessive cobalt intake can cause health issues. Dete...

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Bibliographic Details
Main Authors: Jing Zhu, Hua-Fen Wang, Jia-Xiang Zhang, Man Wang, Yu-Wei Zhuang, Zhi-Guang Suo, Ye-Wu He, Yan-Chang Zhang, Min Wei, Hai-Yan Zhang
Format: Article
Language:English
Published: MDPI AG 2025-08-01
Series:Molecules
Subjects:
fluorescent probe
cobalt ion recognition
benzimidazole-based
Online Access:https://www.mdpi.com/1420-3049/30/15/3309
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Summary:Cobalt, a rare element in the Earth’s crust, is widely used in industries due to its hardness and antioxidant properties. It also plays a vital role in physiological functions, being a key component of vitamin B<sub>12</sub>. However, excessive cobalt intake can cause health issues. Detecting cobalt ions, especially Co<sup>2+</sup>, in food is crucial due to potential contamination from various sources. Fluorescent probes offer high sensitivity, selectivity, a rapid response, and ease of use, making them ideal for the accurate and efficient recognition of Co<sup>2+</sup> in complex samples. In this context, a highly selective fluorescent probe, 2,2′-((3-(1H-benzo[d]imidazol-2-yl)-1,2-phenylene) bis(oxy)) bis(N-(quinolin-8-yl) acetamide) (<b>DQBM-B</b>), was synthesized using chloroacetyl chloride, 8-aminoquinoline, 2,3-dihydroxybenzaldehyde, and benzidine as raw materials for the recognition of Co<sup>2+</sup>. Probe <b>DQBM-B</b> can exhibit fluorescence alone in DMF. However, as the concentration of Co<sup>2+</sup> increased, Photoinduced Electron Transfer (PET) occurred, which quenched the original fluorescence of the probe. Probe <b>DQBM-B</b> shows better selectivity for Co<sup>2+</sup> than other ions with high sensitivity (detection limit: 3.56 μmol L<sup>−1</sup>), and the reaction reaches equilibrium within 30 min.
ISSN:1420-3049

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