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Issue 41, 2020
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Two tetranuclear Cd-based metal–organic frameworks for sensitive sensing of TNP/Fe3+ in aqueous media and gas adsorption

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Abstract

Two novel 3D Cd-MOFs, namely {[Cd4(HDDCP)2(4,4′-bibp)2(H2O)2]·2.5(DOA)·1.5(H2O)}n (1) and {[Cd2(HDDCP)(1,4-bib)(H2O)]·H2O}n (2), where H5DDCP = 2,4-di(2′,5′-dicarboxylphenyl)benzoic acid, 4,4′-bibp = 4,4′-bis(imidazolyl)biphenyl and 1,4-bib = 1,4-bis(1-imidazoly)benzene, have been solvothermally synthesized and structurally characterized by single crystal X-ray diffraction, elemental analysis (EA), thermogravimetric analysis (TGA) and infrared (IR) analysis. The structural analysis showed that 1 should be regarded as a complex 3D structure based on different 1D Cd–(COO) or Cd–(COO)–(COOH) rods as SBUs, and 2 was viewed as a complex 3D framework based on 1D Cd–(COO) rods as SBUs. MOFs 1 and 2 have good stability in boiling water, and alkaline/acidic aqueous solutions (pH = 4–10). The adsorption measurements indicated that the adsorption capacity of 1 for CO2 and CH4 is greater than that of 2, while the adsorption selectivity of 1 for CO2 is superior to that for CH4, which is attributed to the fact that 1 has a larger porosity and CO2 has characteristics such as a linear structure, larger polarizability and significant quadrupole moment. Furthermore, luminescence studies revealed that both 1 and 2 can be used as a highly selective and sensitive sensor for sensing TNP or Fe3+ ions in aqueous solution or soil samples, and the fluorescence quenching mechanism was explored in this work.

Graphical abstract: Two tetranuclear Cd-based metal–organic frameworks for sensitive sensing of TNP/Fe3+ in aqueous media and gas adsorption

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Supplementary files

Article information


Submitted
14 Aug 2020
Accepted
02 Sep 2020
First published
08 Sep 2020

CrystEngComm, 2020,22, 6927-6934
Article type
Paper

Two tetranuclear Cd-based metal–organic frameworks for sensitive sensing of TNP/Fe3+ in aqueous media and gas adsorption

R. Guo, L. Gao, J. Liang, Z. Zhang, J. Zhang, X. Niu and T. Hu, CrystEngComm, 2020, 22, 6927
DOI: 10.1039/D0CE01193B

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