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A novel one-dimensional zigzag chain-like CoII coordination polymer constructed from 4,4'-bi-pyridine (4,4'-bpy) and 2-hy-droxy-benzoate (2-OHbenz) ligands, namely, catena-poly[[(4,4'-bi-pyridine-κN)-(μ-2-hy-droxy-benzoato-κ2OO'(2-hy-droxy-benzoato-κ2O,O'cobalt(II)]-μ-4,4'-bi-pyridine-κ2NN'-[aquahemi(μ-4,4'-bi-pyridine-κ2NN'(2-hy-droxy-benzoato-κO(2-hy-droxy-benzoato-κ2OO'cobalt(II)], [Co2(C7H5O3)4(C10H8N2)2.5(H2O)] n , has been synthesized by reacting cobalt(II) nitrate trihydrate, 4,4'-bpy and 2-hy-droxy-benzoic acid in a mixture of