4.6 Article

Syntheses, structures, surface analysis, DFT and fluorescence properties of three new Cd(II)-MOFs assembled with semi-rigid polycarboxylate

期刊

JOURNAL OF MOLECULAR STRUCTURE
卷 1251, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.molstruc.2021.131957

关键词

Cd(II)-MOFs; Structures; Hirshfeld surface; Fluorescence properties; DFT

资金

  1. Research Projects of Colleges and Universities in Gansu Province [2019A-032]
  2. Tianjin University Lanzhou Jiaotong University Independent Innovation Fund Cooperation Project [2020060]
  3. Natural Science Foundation of Gansu Province [20JR5RA425]

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The synthesis and characterization of three Cd(II)-based metal-organic frameworks with different topological structures and fluorescence properties were studied, showing the influence of metal ions on their properties.
Three Cd(II)-based metal-organic frameworks (MOFs), namely, [Cd(HL1)(4,4'-bipb)](n) (1), [Cd-2(L-2)(4,4'-bipb)(2) (H2O)(3)](n) (2), {[Cd-2(L-3)(4,4'-bipb)(H2O)(2)]center dot(4,4'-bipb)(0.5)}(n) (3), where H3L1, H4L2, H4L3, and 4,4'-bipb are semi-rigid 2-(4-carboxyphenoxy) terephthalic acid, 3-(2,4-dicarboxyphenoxy)phthalic acid, 3,3'-(1,3-phenylenebis(oxy))diphthalic acid, and 1,4-bis(pyridin-4-yl)benzene, respectively, are synthesized in the presence of 4,4'-bipb and Cd(II) ions by hydrothermal method. 1 displays a 2,6-connected 3D topological structure. 2 features a 3D framework with 4,5,5-connected topology. 3 shows a 4,4,4-connected 3D topology. The fluorescence properties of 1-3 were determined in a dilute aqueous suspension at room temperature. The initial fluorescence intensity of 1 and 2 was almost completely quenched after the addition of Fe(NO3)(3) solution. It is confirmed that after the addition of AgNO3 solution, the fluorescence intensity of 3 was quenched significantly, but the fluorescence intensity is increased after the Al(NO3)(3) and Fe(NO3)(3) solutions are added. (C) 2021 Published by Elsevier B.V.

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