A zinc(II) coordination polymer, [Zn4( o -bda)4( p -pbim)4] n , with strong blue fluorescence

A zinc(II) coordination polymer, [Zn4(o-bda)4(p-pbim)4] n (1) (p-pbim = 4-pyridylbenzimidazole, o-bda2− = o-phenylenediacetic acid dianion), has been synthesized by hydrothermal method and characterized by elemental analysis, IR, TG, photoluminescence and X-ray single crystal diffraction. Complex 1 crystallizes in a monoclinic system and space group P21 /n, with a = 14.231(3) A, b = 16.257(4) A, c = 16.794(4) A, β = 100.262(1)°, and Z = 8; R 1 for 6475 observed reflections [I > 2σ(I)] was 0.0420. Complex 1 shows a bi-chain structure fabricated by the tetranuclear zinc unit. Two zinc(II) ions are five coordinate with distorted trigonal-bipyramid geometry; the other two zinc(II) ions are four coordinate with distorted tetrahedral geometry. Complex 1 builds the 1-D bi-chain structure with two different subrings A and B, which are 32-member and 14-member rings, respectively. There exists a 2-D supramolecular network linked by hydrogen-bonding interactions (2.695 and 2.807 A). A 3-D supramolecular network is f...