Hydrothermal Synthesis and Crystal Structure of a New 2D Layered Cadmium(II) Coordination Polymer:[Cd(bimc)_2]_n(bimc=1H-Benzimidazole-5-carboxylate)

1 INTRODUCTION Coordination polymers have attracted the atten- tion of chemists, physicists, and materials scientists owing to their fascinating structures and potential functional applications in the last decade1～4]. The bridging ligands play a central role in constructing functional coordination polymers, and weak nonco- valent interactions like hydrogen bonding or π-π stacking plays an important role in molecular self- assembly5～7]. As a multidentate and rigid ligand with multi-pr…

Hydrothermal Synthesis and Crystal Structure of a New 2D Layered Cadmium(II) Coordination Polymer:[Cd(bimc)_2]_n(bimc=1H-Benzimidazole-5-carboxylate)

A new coordination 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) ?, V = 2991.8(15) ?3, Mr = 434.68, Z = 8, Dc = 1.930 g/cm3, F(000) = 1712, μ(MoKα) = 1.492 mm-1, the final R = 0.0410 and wR = 0.0804 for 1661 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–), N1 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.