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Highly selective and sensitive optical probe for Fe3+ base on a well water-soluble squarylium dye

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) ion with the existence of competing cations (Na+, Mg2+, Al3+, Cr3+, Zn2+, K+, Ca2+, Ba2+, Pb2+, Ni2+, Co2+, Ag+, Cu2+, Cd2+) in deionized water. After the Fe3+ was added, the absorbance and fluorescence of the SQ water solution were 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, transform infrared (FT-IR) and 1H nuclear magnetic resonance (1H NMR). “Naked eye” detection was performed, which indicated the potential application of SQ on conveniently, selectively and fast detection of Fe3+.

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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, Accepted Manuscript
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    Highly selective and sensitive optical probe for Fe3+ base on a well water-soluble squarylium dye

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

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