A novel 3D energetic coordination polymer containing Co(II) atoms in a pentanuclear cluster |
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| Authors: | R-F Wu H-P Shi J-R Zhang F-F Chang |
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| Institution: | 1.College of Chemical Engineering,Inner Mongolia University of Technology,Hohhot,P. R. China;2.College of Science,Inner Mongolia Agricultural University,Hohhot,P. R. China |
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| Abstract: | A novel coordination polymer Co5(OH)2(dnbpdc)4(H2O)6]·16H2O (1) (dnbpdc = 6,6′-dinitro-4,4′-biphenyldicarboxylic acid) is obtained from a hydrothermal reaction. The structure of complex 1 is characterized by elemental analysis, IR spectroscopy, and single crystal X-ray diffraction analysis. The title compound (C56H70Co5N8O56, M r = 2045.85) crystallizes in the triclinic space group P-1 with a = 11.9349(2) Å, b = 12.1895(2) Å, c = 15.420(2) Å, α = 109.390(7)°, β = 94.786(1)°, γ = 108.027(9)°, V = 1968.4(4) Å3, Z = 1, D c = 1.726 g/cm3, F(000) = 1045, μ(MoK α) = 1.154 mm–1, T = 133(2) K, the final R = 0.0316 and wR = 0.0692 for 7032 observed reflections with I > 2σ(I). The coordination polymer is built of a pentanuclear Co(II) cluster, four dnbpdc ligands, two hydroxyl groups, six coordination water and sixteen crystal water molecules. Ligand oxygen atoms exhibit three types of coordination modes (monodentate, syn-syn bridging bidentate and bridging tridentate). Moreover, the infinite three-dimensional supramolecular network is generated by coordination and hydrogen bonds. The thermal stability of complex 1 is evaluated by differential scanning calorimetry and thermogravimetric analysis. |
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