A NOVEL 3D ENERGETIC COORDINATION POLYMER CONTAINING Co(II) ATOMS IN A PENTANUCLEAR CLUSTER
R.-F. Wu1, H.-P. Shi2, J.-R. Zhang1, F.-F. Chang1
1Inner Mongolia University of Technology, Hohhot 010051, P. R. China
2Inner Mongolia Agricultural University, Hohhot 010018, P. R. China
Keywords: coordination polymer, pentanuclear clusters, energetic materials, coordination polymer, pentanuclear clusters, energetic materials
Abstract
A novel coordination polymer [Co5(OH)2(dnbpdc)4(H2O)6]×16H2O (1) (dnbpdc = 6,6¢-dinitro-4,4¢-biphenyl-dicarboxylic 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, a = 109.390(7)°, b = 94.786(1)°, g = 108.027(9)°, V = 1968.4(4) Å3, Z = 1, D c = 1.726 g/cm3, F (000) = 1045, m(Mo K a) = 1.154 mm-1, T = 133(2) K, the final R = 0.0316 and wR = 0.0692 for 7032 observed reflections with I > 2s( 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 supra-molecular 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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