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Issue 4, 2016
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Hydrothermal synthesis and structural characterization of metal–organic frameworks based on new tetradentate ligands

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Abstract

The hydrothermal reaction of two new tetradentate ligands with different metal salts of cadmium nitrate, zinc chloride, cobalt nitrate and deprotonated terephthalic acid (H2tp), isophthalic acid (H2ip), 4,4′-oxybisbenzoic acid (H2obba) in H2O/DMF or H2O/methanol gave three metal–organic frameworks (MOFs): {[Zn2(L1)(tp)(formate)2]·H2O}n (1), {[Cd2(L2)(ip)2]·2H2O}n (2), {[Co2(L2)(obba)2]}n (3) (L1 = 1,2-bis {2,6-bis [(1H-imidazol-1-yl) methyl]-4-methylphenoxy} ethane, L2 = 1,3-bis {2,6-bis [(1H-imidazol-1-yl) methyl]-4-methylphenoxy} propane). The structures of the frameworks are established by single-crystal X-ray diffraction. Compound 1 is a three-dimensional (3D) framework with a 2-fold interpenetrated form, which exhibits a 2-nodal (3,4)-connected fsh-3,4-P21/c net with a {83}2{85·10} topology. Compound 2 has a 2-nodal (4,8)-connected 3D framework where the dinuclear cadmium cluster secondary building units (SBUs) assemble with isophthalate and ligand L2 to construct a rare topological type sqc22 net with a {32·54}{34·44·510·610} topology. Whereas, Compound 3 can be extended to a 2D interlocked (4,4)-connected 4,4 L28 net with the point symbol {4·64·8}2{42·64}. L1 and L2 are tetradentate ligands with diverse linkers and display different coordination modes. In addition, the thermal stability and photochemical properties of the frameworks are also investigated.

Graphical abstract: Hydrothermal synthesis and structural characterization of metal–organic frameworks based on new tetradentate ligands

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The article was received on 18 Sep 2015, accepted on 19 Nov 2015 and first published on 23 Nov 2015


Article type: Paper
DOI: 10.1039/C5DT03658E
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Dalton Trans., 2016,45, 1382-1390

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    Hydrothermal synthesis and structural characterization of metal–organic frameworks based on new tetradentate ligands

    Y. Liang, W. Yuan, S. Zhang, Z. He, J. Xue, X. Zhang, L. Jing and D. Qin, Dalton Trans., 2016, 45, 1382
    DOI: 10.1039/C5DT03658E

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