Hydrothermal Synthesis and Crystal Structure of a New 2D Layered Cadmium(Ⅱ) Coordination Polymer:Cd(bimc)2n (bimc = 1H-Benzimidazole-5-carboxylate)

摘要

A newcoordination polymer [Cd(bimc)2]n was obtained by the reaction of Hbimc with Cd(NO3)2·4H2O in NaOH solution,and characterized by elemental analysis,IR and single-crystal X-ray diffraction. The crystal belongs to orthorhombic, space group Pbcn with a = 12.533(4),b = 15.705(5), c = 15.200(5) (A), V= 2991.8(15) (A)3, Mr = 434.68, Z = 8, Dc = 1.930 g/cm3, F(000) =1712, μ(MoKa) = 1.492 mm-1, the final R = 0.0410 and wR = 0.0804 for 166l observed reflections (I＞2σ(I)). The Cd atom exhibits a distorted six-coordinate CdN2O4 octahedral coordination geometry. The complex molecules are linked by both μ2-(η2-O, O-), Nl and μ2-(η2-O, O-), N3 coordination modes of ligands to form cross-like wave (4, 4) layer structures which are further stacked through interlayer hydrogen bonds and π-π stacking interactions in an offset fashion to form a 3D supramolecular structure.