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Pubmed ID :29880253
Publication Date : //

Novel dual-functional fluorescent sensors based on bis(5,6-dimethylbenzimidazole) derivatives for distinguishing of Ag and Fe in semi-aqueous medium.


Three novel bisbenzimidazole derivatives have been synthesized and developed as dual-functional fluorescent sensors for the rapid and highly selective detection of Ag and Fe ions in semi-aqueous medium with distinct spectral response for the first time. The absorption intensity is drastically decreased after the addition of Ag. Contrarily, it is markedly increased upon the addition of Fe. And there is a good linear relation at low concentration of both Ag and Fe, which provides a quantitative method for their detection. Similarly, the sensors show a distinct fluorescence response towards Ag and Fe with a different fluorescence color change under UV light. In addition, no significant changes and interference can be observed with other metal ions. The sensing mechanism studies confirm that the N atom in CN of benzimidazole ring of sensor 4a may bind with Ag or Fe ion to form metal complex. And there is only a static quenching process for the 4-Ag complex system, but both dynamic and static quenching processes occur in the 4-Fe complex system. Moreover, sensors 4 can steadily work in solution with a wide range of pH 4-13 and rapidly respond to Ag and Fe with a response time of 10 s. Finally, the sensors have been successfully applied to the visual detection of Ag and Fe not only in solution, but also in test paper.

Authors : Wu Yan-Cheng , Jiang Kai , Luo Shi-He , Cao Liang , Wu Han-Qing , Wang Zhao-Yang ,

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