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.

A novel one-dimensional zigzag chain-like Co coordination polymer constructed from 4,4'-bi-pyridine (4,4'-bpy) and 2-hy-droxy-benzoate (2-OHbenz) ligands, namely, -poly[[(4,4'-bi-pyridine-κ)-(μ-2-hy-droxy-benzoato-κ :')(2-hy-droxy-benzoato-κ ,')cobalt(II)]-μ-4,4'-bi-pyridine-κ :'-[aquahemi(μ-4,4'-bi-pyridine-κ :')(2-hy-droxy-benzoato-κ(2-hy-droxy-benzoato-κ :')cobalt(II)], [Co(CHO)(CHN)(HO)] , has been synthesized by reacting cobalt(II) nitrate trihydrate, 4,4'-bpy and 2-hy-droxy-benzoic acid in a mixture of water and methanol at room temperature. There are two independent Co centers, Co1 and Co2, in the asymmetric unit, revealing a distorted octa-hedral geometry with chromophore types of [CoNO] and [CoNOO'], respectively. The Co1 ions are doubly bridged by 2-OHbenz ligands with - coordination mode, generating a dinuclear unit.