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Assembly of four new cobalt coordination polymers modulated by N-coligands: sensitive and selective sensing of nitroaromatics, Fe3+ and Cr2O72− in water

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Abstract

Four new Co coordination polymers (CPs), formulated as [Co(L)(phen)] (1, 1D), [Co3(L)3(phen)2·4H2O] (2, 2D), [Co3(L)3(2,2′-bipy)2·8H2O] (3, 2D) and [Co2(L)3(4,4′-bipy)2·] (4, 3D) (H2L = 6-methoxy-2,2′-sulfone-4,4′-dicarboxylic acid, phen = 1,10-phenanthroline, 2,2′-bipy = 2,2′-bipyridine, 4,4′-bipy = 4,4′-bipyridine), have been solvothermally synthesized based on a functional dicarboxylate bridging ligand in the presence of various N-coligands. Complex 1 features a 3D supramolecular architecture composed of parallel linear chains assembled via π–π interactions. Complexes 2 and 3 have similar structures, which are both (4,4)-connected 2D networks possessing 1D channels based on linear trinuclear [Zn3(CO2)6N4] clusters. Complex 4 contains (4,4)-connected 2D layers based on binuclear clusters, which are further linked into a 3D pillar-layered framework by 4,4′-bipy. Luminescence studies indicate that 2 and 3 both show strong fluorescence and good stability in water, and they can be used as multi-responsive sensors for selective sensing of nitroaromatics, Fe3+ and Cr2O72− in water via luminescence quenching with fast response. Remarkably, 2 and 3 can be conveniently regenerated for at least four times without sacrificing their quenching efficiencies. The possible mechanisms for the luminescence quenching have been investigated in detail.

Graphical abstract: Assembly of four new cobalt coordination polymers modulated by N-coligands: sensitive and selective sensing of nitroaromatics, Fe3+ and Cr2O72− in water

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Article information


Submitted
06 Nov 2019
Accepted
28 Jan 2020
First published
03 Feb 2020

CrystEngComm, 2020, Advance Article
Article type
Paper

Assembly of four new cobalt coordination polymers modulated by N-coligands: sensitive and selective sensing of nitroaromatics, Fe3+ and Cr2O72− in water

Q. Tu, L. Ren, Y. Cui, A. Cheng and E. Gao, CrystEngComm, 2020, Advance Article , DOI: 10.1039/C9CE01757G

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