A set of new transition metal-based coordination complexes dependent upon Hpztza ligand (Hpztza=2-(5-(pyrazin-2-yl)-2H-tetrazol-2-yl) acetic acid)

Crystal structure of a novel one-dimensional zigzag chain-like cobalt(II) coordination polymer constructed from 4,4'-bi-pyridine and 2-hy-droxy-benzoate ligands

The synthesis, crystal structure and physical properties of a novel one-dimensional zigzag chain-like Co^II coordination polymer, [Co₂(2-OHbenz)₄(4,4′-bpy)_2.5(H₂O)]_n, constructed from 4,4′-bi­pyridine (4,4′-bpy) and 2-hy­droxy­benzoate (2-OHbenz) are reported.

A novel one-dimensional zigzag chain-like Co^II coordination polymer constructed from 4,4′-bi­pyridine (4,4′-bpy) and 2-hy­droxy­benzoate (2-OHbenz) ligands, namely, catena-poly[[(4,4′-bi­pyridine-κN)­(μ-2-hy­droxy­benzoato-κ²O:O′)(2-hy­droxy­benzoato-κ²O,O′)cobalt(II)]-μ-4,4′-bi­pyridine-κ²N:N′-[aquahemi(μ-4,4′-bi­pyridine-κ²N:N′)(2-hy­droxy­benzoato-κO(2-hy­droxy­benzoato-κ²O:O′)cobalt(II)], [Co₂(C₇H₅O₃)₄(C₁₀H₈N₂)_2.5(H₂O)]_n, has been synthesized by reacting cobalt(II) nitrate trihydrate, 4,4′-bpy and 2-hy­droxy­benzoic acid in a mixture of water and methanol at room temperature. There are two independent Co^II centers, Co1 and Co2, in the asymmetric unit, revealing a distorted octa­hedral geometry with chromophore types of [CoN₂O₄] and [CoN₂O₃O′], respectively. The Co1 ions are doubly bridged by 2-OHbenz ligands with syn–anti coordination mode, generating a dinuclear unit. The bridging 4,4′-bpy ligands connect these dinuclear units and the mononuclear Co2 chromophores, providing a one-dimensional alternating zigzag chain-like structure. In the crystal, inter­molecular hydrogen bonds, C—H⋯π and π–π stacking inter­actions are observed and these help to consolidate the packing. In addition, the physical properties of the title compound are reported.