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Issue 24, 2018
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A new fluorescent–colorimetric chemosensor for cobalt(II) ions based on bis-benzimidazolium salt with three anthraquinone groups

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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 spectroscopies; its single crystal structure was also obtained. By fluorescence and UV titrations, 1H NMR titrations, and 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 accompanied with 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 a smartphone with the calculated limit of detection down to 0.47 μM.

Graphical abstract: A new fluorescent–colorimetric chemosensor for cobalt(ii) ions based on bis-benzimidazolium salt with three anthraquinone groups

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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., 2018,42, 20049-20055

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

    Q. Liu, Z. Hu and Z. Zhao, New J. Chem., 2018, 42, 20049
    DOI: 10.1039/C8NJ04983A

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