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Issue 20, 2018
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Highly selective and sensitive optical probe for Fe3+ based on a water-soluble squarylium dye

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Abstract

A highly selective and sensitive water-soluble optical probe based on a squarylium dye, 2,3,3-trimethyl-3H-indolenine-5-sulfonate squaraine (SQ) has been successfully synthesized. The as-prepared SQ can efficiently recognize iron(III) ions in the presence of competing cations (Na+, Mg2+, Al3+, Cr3+, Zn2+, K+, Ca2+, Ba2+, Pb2+, Ni2+, Co2+, Ag+, Cu2+, Cd2+) in deionized water. After Fe3+ was added, the absorbance and fluorescence of the SQ water solution changed, and the color changed from sky blue to pale yellow. The binding constant (Ka) of SQ–Fe3+ was calculated to be about 1.14 × 104 M−1. Correspondingly, the chelating mode of SQ–Fe3+ was confirmed by Job's plot, Fourier transform infrared (FT-IR) and 1H nuclear magnetic resonance (1H NMR). “Naked eye” detection was performed, which indicated the potential application of SQ for convenient, selective and fast detection of Fe3+.

Graphical abstract: Highly selective and sensitive optical probe for Fe3+ based on a water-soluble squarylium dye

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Publication details

The article was received on 23 Dec 2017, accepted on 11 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C7AY02948A
Citation: Anal. Methods, 2018,10, 2353-2359
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    Highly selective and sensitive optical probe for Fe3+ based on a water-soluble squarylium dye

    Z. Xu, M. Jiang, C. Zhang, J. Mei, Z. Li, S. Xu and L. Wang, Anal. Methods, 2018, 10, 2353
    DOI: 10.1039/C7AY02948A

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