Hydrothermal Synthesis, Crystal Structure and Thermal Analyses of Pyrazine-2,3-dicarboxylic Acid Bridged Co（II） Coordination Polymer of 2 ∞[Co（phen）（μ-L）3／3]·H2O（H2L = Pyrazine-2,3-dicarboxylic Acid）
摘要
A novel pyrazine-2,3-dicarboxylic acid bridged Co(Ⅱ) phen complex 2∞ [Co-(phen)(μ-L)3/3]·H2O (H2L = pyrazine-2,3-dicarboxylic acid) has been hydrothermally synthesized,and X-ray single-crystal diffraction analysis shows that it crystallizes in the monoclinic system,space group P21/n with a= 11.480(2), b= 11.885(2), c=12.939(3)A,β=110.55(3)°,V= 1653.1(6)A^3 Mr = 423.25, Dc = 0.425g/cm^3, Z= 4, R = 0.0361 and wR= 0.1011. The title complex consists of 2D 2∞ [Co(phen)(μ-L)3/3] layers and crystal water molecules. Each Co atom is octahedrally coordinated by three N atoms and three 2∞ atoms to form 2D 2= [Co(phen)(μ-L)3/3]polymeric layers. Furthermore, such 2D layers are stacked into 3D supramolecular frameworks via Van der Waals' intermolecular forces, strong and weak hydrogen-bond interactions. The coordination phen and crystal water molecules are resided into cavities of the frameworks.