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A new fluorescent-colorimetric chemosensor for cobalt(II) ion based on bis-benzimidazolium salt with three anthraquinone groups

Abstract

A novel fluorescent-colorimetric chemosensor 1,8-bis{2-{N-[2’-(8’-hydroxy-9,10-anthraquinon-1-yloxy)ethyl]benzimidazoliumyl}ethoxy}-9’,10’-anthraquinone hexafluorophosphate (3) was prepared and characterized by 1H and 13C NMR spectroscopy. Its single crystal structure was also obtained. By fluorescence and UV titrations, 1H NMR titrations, HRMS and IR spectra, we explored the cation recognition performance of 3, and the results revealed that 3 was a highly effective chemosensor for Co2+. After mixing with Co2+, a distinct color change (from orange to red under visible light) was visible to naked eyes, and accompanied remarkable fluorescence quenching. A hypochromatic shift (ca. 27 nm) and a new peak at 487 nm were observed in the absorption spectra of 3. Furthermore, 3 was also applied for the detection of Co2+ by using smartphone with the calculated limit of detection down to 0.47 μM.

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Publication details

The article was received on 01 Oct 2018, accepted on 06 Nov 2018 and first published on 07 Nov 2018


Article type: Paper
DOI: 10.1039/C8NJ04983A
Citation: New J. Chem., 2018, Accepted Manuscript
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    A new fluorescent-colorimetric chemosensor for cobalt(II) ion based on bis-benzimidazolium salt with three anthraquinone groups

    Q. Liu, Z. Hu and Z. Zhao, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ04983A

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