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In the title compound, poly[[(μ2-oxalato)[μ2-1,2-(pyridin-4-yl)ethylene]zinc(II)] dihydrate], {[Zn(μ2-C4O4)(μ2-C12H10N2)]·2H2O}n, 2-butyndioate and 1,2-bis(pyridin-4-yl)ethylene ligands bridge ZnII ions to form a three-dimensional network. The three-dimensional networks are fivefold interpenetrated, and each network features a 4-connected unimodal net with a Schläfli symbol of 66 (dia) with the ZnII ions as the nodes. Twofold rotation axes are located at the ZnII ions and the midpoints of the C[triple-bond]C bond of 2-butyndioate and the C=C bond of 1,2-bis(pyridin-4-yl)ethylene. The coordination geometry around the ZnII ions is tetrahedral constructed from two O atoms from 2-butyndioate and two N atoms from 1,2-bis(pyridin-4-yl)ethylene. Solvate water molecules are connected with each other via hydrogen bonds to create chains running parallel to [010] that are captured in infinite channels of the three-dimensional framework through hydrogen bonds to the non-coordinating carboxylate O atoms of the 2-butyndioate units. The water molecules are disordered, with two alternative positions that are distinguished by the direction of the chains, but that share the H atom hydrogen bonded to the carboxylate O atom

Poly[[(μ2-but-2-ynedioato)[μ2-1,2-(pyridin-4-yl)ethylene]zinc(II)] dihydrate]