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-kappa N-3}zinc(II)]-mu-hexane-1,6-dicarboxylato-kappa O-4(1),O-1':O-6,O-6'] monohydrate], {[Zn(C6H8O4)(C9H8N6)(2)]center dot 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 (H(2)adi) 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 center dot center dot center dot 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.