Hydrothermal Synthesis of a Series of Interpenetrated Metal-Organic Frameworks Based on Long Multicarboxylate and Long Heterocyclic Aromatic Ligands

摘要

Four entangled polymers, namely, [Ni(bpea)(L1)(H2O)](n) (1), [Ni(bpea)(L2)](n) (2), {[Ni(bpea)(L3)(1.5)(H2O)]center dot(L3)}(n) (3), and [Co(bpea)(L3)](n) (4) (H(2)bpea biphenylethene-4',4-dicarboxylic acid, L1 = 1,3-di(4-pyridyl)propane, L2 = 1,4-bis(imidazol-1-yl-methylene)benzene, L3 1,4-bis(1-imidazolyl)benzene) have been synthesized by a hydrothermal reaction. Complex 1 has a 2-fold (4,4)-net parallel interpenetrating structure, while complex 2 shows three-dimensional (3D) structure with 2-fold (4,4)-net inclined polycatenation. Complex 3 displays 3-fold interpenetrated 3D structure, which is the first example of an interpenetrated structure of 4(4)6(6)-sqp topology. Complex 4 is a 3D structure with a 3-fold interpenetrated alpha-Po topology. Our results imply that the self-assembly of long multicarboxylate and long heterocyclic aromatic ligands with metal ions is a facile assay to produce various interpenetrated metal-organic frameworks. Furthermore, their thermal properties were studied by thermogravimetric analysis. The magnetic property of 4 was measured.