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Reasonable Design, crystal Structure and sensing properties of Series Luminescent MOF Based on the Flexible Tetracarboxylate Ligand and N‑Donor Ligands

Abstract

Six Zn/Cd metal-organic frameworks (MOFs) {[Zn2(dppa)(bpy)2(H2O)]•H2O}n (1), {[Zn2(dppa)(phen)2(H2O)]∙3H2O}n (2), [Cd(H2dppa)(bpy)]n (3), {[Cd2(dppa)(dye)]•H2O}n (4), {Cd4(dppa)2(H2O)9]∙H2O}n (5) and {[Cd2(dppa)(bpe)2(H2O)]•H2O}n (6) (H4dppa=5-(3’4’-dicarboxylphenoxy)isophthalic acid, phen=1,10-phenanthroline, bpy=2,2'-bipyridine, dye=2,2’-dipyridylamine, bpe=1,2-bis(4-pyridy) ethane), were synthesized and structurally characterized by elemental analyses, the plasma (ICP) spectrometer, IR spectroscopy, and single-crystal X-ray diffraction analyses. 1-3 are 1D ring chains. 4 shows a 2D bilayer network based on quarnuclear cadmium cluster linked by (dppa)4- ligand. 5 displays a 2D bilayer network based on trinuclear cadmium cluster, in which (dppa)4- ion shows two different coordination modes. Different from the above MOFs, 6 possesses a 3D network structure based on dinuclear cadmium units cross-linked by (dppa)4- and bpe ligands. For 1-6, weak hydrogen bonding and π…π stacking contacts link the discrete 1D chains or 2D network to form high-dimensional supramolecular structures. Especially, in 1-6, (dppa)4- ligand display seven different coordination modes and conformations, which may show a natural synergy in structural diversity of the resultant MOFs. The remarkable character of these frameworks is that 2 demonstrates highly selective and sensitive bifunctional luminescent sensor towards aceton and Fe3+ ion. In addition, the thermal stabilities and luminescence properties were also studied.

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Publication details

The article was received on 30 Jul 2019, accepted on 04 Nov 2019 and first published on 04 Nov 2019


Article type: Paper
DOI: 10.1039/C9CE01186B
CrystEngComm, 2019, Accepted Manuscript

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    Reasonable Design, crystal Structure and sensing properties of Series Luminescent MOF Based on the Flexible Tetracarboxylate Ligand and N‑Donor Ligands

    X. Chen, H. Cui, H. Yang, X. Wang, L. Liu, Y. X. Ren and J. Wang, CrystEngComm, 2019, Accepted Manuscript , DOI: 10.1039/C9CE01186B

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