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Two 2D multiresponsive luminescence coordination polymers for selective sensing of Fe3+, CrVI anions and TNP in aqueous medium

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Abstract

Two luminescence coordination polymers (CPs) formulated as {[Zn(L)(H2O)2]·H2O}n (1) and {[Cd(L)(H2O)2]·4H2O}n (2) are successfully prepared by solvothermal reactions between the corresponding metal(II) ions and 5-(4-pyridylamino)isophthalic acid (H2L). Crystallographic studies reveal that 1 and 2 exhibit similar 2D honeycomb layer networks, but have different numbers of lattice water molecules. The layers are connected through hydrogen bonds to give 3D supramolecular frameworks. CPs 1 and 2 possess coordinated water molecules and uncoordinated oxygen atoms as well as electron-rich amide groups, which are easy to recognize diverse analytes. Moreover, they show considerable stability in aqueous systems with a broad pH range from 3 to 12. Luminescence sensing experiments indicate that they can be regarded as highly sensitive sensors for detecting Fe3+ ions, CrVI anions (CrO42− and Cr2O72−) and 2,4,6-trinitrophenol (TNP) through luminescence quenching. In addition, the mechanisms for the luminescence response of CPs 1 and 2 towards Fe3+ ions, CrVI anions and TNP have been investigated in detail. Besides, CPs 1 and 2 represent two very good examples of versatile Zn/Cd-CP probes capable of sensing Fe3+ ions, CrVI anions and TNP.

Graphical abstract: Two 2D multiresponsive luminescence coordination polymers for selective sensing of Fe3+, CrVI anions and TNP in aqueous medium

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Publication details

The article was received on 04 Jul 2019, accepted on 31 Jul 2019 and first published on 01 Aug 2019


Article type: Paper
DOI: 10.1039/C9CE01045A
CrystEngComm, 2019, Advance Article

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    Two 2D multiresponsive luminescence coordination polymers for selective sensing of Fe3+, CrVI anions and TNP in aqueous medium

    A. Zhou, H. Wei, W. Gao, J. Liu and X. Zhang, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C9CE01045A

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