Hydrothermal syntheses, crystal structures and topological analyses of four new 3D coordination polymers with mixed ligands

Crystal structure of poly[diaqua-(μ3-fumarato)-(μ3-maleato)-(μ4-1,2,4,5-tetrakis((1H-1,2,4-triazol-1-yl)methyl)benzene)tetracadmium(II)] dihydrate, C34H32N12O9Cd4

C34H32N12O9Cd4, monoclinic, P 1 ‾ $P\overline{1}$ (no. 2), a = 9.894(2) Å, b = 9.942(2) Å, c = 10.896(2) Å, α = 94.35(3)°, β = 96.80(3)°, γ = 93.35(3)°, V = 1058.7(4) Å3, Z = 1, R gt (F) = 0.0406, wR ref(F 2) = 0.0984, T = 293(2) K.

A one-dimensional zinc(II) coordination polymer with a three-dimensional supramolecular architecture incorporating 1-[(1H-benzimidazol-2-yl)methyl]-1H-tetrazole and adipate

The synthesis of coordination polymers or metal-organic frameworks (MOFs) has attracted considerable interest owing to the interesting structures and potential applications of these compounds. It is still a challenge to predict the exact structures and compositions of the final products. A new one-dimensional coordination polymer, catena-poly[[[bis{1-[(1H-benzimidazol-2-yl)methyl]-1H-tetrazole-κN³}zinc(II)]-μ-hexane-1,6-dicarboxylato-κ⁴O¹,O^1':O⁶,O^6'] monohydrate], {[Zn(C₆H₈O₄)(C₉H₈N₆)₂]·H₂O}_n, has been synthesized by the reaction of Zn(Ac)₂ (Ac is acetate) with 1-[(1H-benzimidazol-2-yl)methyl]-1H-tetrazole (bimt) and adipic acid (H₂adi) at room temperature. In the polymer, each Zn^II ion exhibits an irregular octahedral ZnN₂O₄ coordination geometry and is coordinated by two N atoms from two symmetry-related bimt ligands and four O atoms from two symmetry-related dianionic adipate ligands. Zn^II ions are connected by adipate ligands into a one-dimensional chain which runs parallel to the c axis. The bimt ligands coordinate to the Zn^II ions in a monodentate mode on both sides of the main chain. In the crystal, the one-dimensional chains are further connected through N-H...O hydrogen bonds, leading to a three-dimensional supramolecular architecture. In addition, the title polymer exhibits fluorescence, with emissions at 334 and 350 nm in the solid state at room temperature.

Poly[tetrachlorido{μ4-tetrakis[(imidazol-1-yl)methyl]methane-κ4N3:N3':N3'':N3'''}dizinc(II)] exhibiting a three-dimensional diamond topology

The title novel noncentrosymmetric metal-organic framework, [Zn2Cl4(C17H20N8)]n, was prepared solvothermally using the tetradentate tetrakis[(imidazol-1-yl)methyl]methane (tiym) linker in the presence of zinc nitrate under acidic conditions. The asymmetric unit contains one Zn(II) cation, two Cl(-) anions and a quarter of each of two symmetry-independent tiym ligands. Each Zn(II) cation is four-coordinated by two Cl(-) anions and two imidazole N atoms from two tiym ligands, forming a distorted tetrahedral coordination geometry. The tetrahedral tetradentate tiym linker has a quaternary C atom located on a crystallographic -4 axis. With its four peripheral imidazole N atoms, the linkers are bridged by four [ZnCl2] subunits to generate a three-dimensional diamond topological framework, which is represented by the Schläfli symbol {6(6)}. To the best of our knowledge, the title compound is the first example of a non-interpenetrating diamond net based on the tiym ligand.