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Issue 44, 2017
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A novel polydentate Schiff-base derivative developed for multi-wavelength colorimetric differentiation of trace Fe2+ from Fe3+

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Abstract

A novel Schiff-base derivative containing polydentate ligands, N-2′-hydroxyl-1′-naphthyl methylene-3-hydroxyl-2-amino pyridine (NNAP), was identified and developed. After its structure was characterized by FTIR, 1H NMR, mass spectra and element analyses, it was noted that NNAP displayed multi-wavelength colorimetric responses to Fe2+ and Fe3+, accompanied by differentiable color changes, i.e., from yellow to brown in the presence of Fe2+ but to colorless upon addition of Fe3+. Importantly, the multi-wavelength colorimetric responses to trace Fe2+ and Fe3+, i.e., at 522 nm, 448 nm and 389 nm for Fe2+ detection, and at 448 nm and 389 nm for Fe3+ detection, could efficiently eliminate system error. Their different action mechanisms, a 1 : 1 complex mode for NNAP–Fe2+ and 1 : 2 for NNAP–Fe3+, were proposed and confirmed by means of a Job's plot and theoretical calculation. NNAP would be a practical probe for multi-wavelength colorimetric differentiation of trace Fe2+ from Fe3+.

Graphical abstract: A novel polydentate Schiff-base derivative developed for multi-wavelength colorimetric differentiation of trace Fe2+ from Fe3+

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Publication details

The article was received on 11 Sep 2017, accepted on 15 Oct 2017 and first published on 16 Oct 2017


Article type: Paper
DOI: 10.1039/C7AY02167D
Citation: Anal. Methods, 2017,9, 6240-6245
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    A novel polydentate Schiff-base derivative developed for multi-wavelength colorimetric differentiation of trace Fe2+ from Fe3+

    Z. Yan, Y. Zhu, J. Xu, C. Wang, Y. Zheng, P. Li, L. Hu and J. You, Anal. Methods, 2017, 9, 6240
    DOI: 10.1039/C7AY02167D

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