N,N'-Bis(4-pyridylmethyl)oxalamide, C(14)H(14)N(4)O(2), exists as a dimer which is extended into a two-dimensional network with other dimers through pyridine-amide hydrogen bonds. The crystal structure of the title coordination polymer, {[CoCl2(C(14)H(14)N(4)O(2))].0.5H2O}n, features a one-dimensional zigzag chain, in which the cobalt ion sits at a twofold symmetry position and adopts a tetrahedral geometry, and the bridging ligand lies on an inversion center and connects to Co(II) ions in a bis-monodentate mode. Furthermore, two interwoven chains create a cavity of ca 8.6 x 8.6 A, which produces a three-dimensional channel. Water molecules are held in the channel by hydrogen bonds.
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