Hydrothermal synthesis, crystal structure of zinc(II) complex of bis(2-benzimidazole) and aromatic carboxylate ligands

A novel one-dimensional zinc(II) complex: [Zn₂L ₂(H₂C₃PIm)₂]_n (1) with 2-carboxymethylbenzoic acid (H₂L) and 2,2'-(1,3- propanediyl)bis(1H- benzimidazole) (H₂C₃PIm) has been synthesized by means of hydrothermal method and characterized by X-ray single-crystal diffraction. The crystal is of triclinic, space group P-1 with a = 1.3354(5) nm, b= 1.3991(5) nm, c = 1.4245(5) nm, α = 83.617(5)°, β = 70.742(5)°, γ = 70.913(5)°, V = 2.3744(15) nm3, Dc = 1.451 g cm^-3, Z = 2, F(000) = 1068, Goof = 1.073, R₁ = 0.1067, wR₂ = 0.3379. The complex 1 shows a novel one-dimensional (1D) zigzag chain structure along the a axis and further extended into a 2D supramolecular structure through N-H⋯O hydrogen bonding interactions. The π-π packing interactions contribute to the formation of the three-dimensional supramolecular architecture and stabilize the crystal structure.