Poly[aqua­(μ₂-pyrimidine-2-carboxyl­ato-κ⁴O,N:O′,N′)(nitrato-κO)cadmium]

In the title polymer, [Cd(C₅H₃N₂O₂)(NO₃)(H₂O)]_n, the Cd^II atom is seven-coordinate in a distorted capped octa­hedral geometry by two N atoms of two different pyrimidine dicarboxyl­ate (pmc) ligands, three O atoms from three separate pmc ligands, and two O atoms of disordered nitrate anions or water mol­ecules. The Cd^II atoms are bridged by the pmc ligands in a chelating/bridging bis-bidentate and chelating bidentate mode, forming sheets parallel to (20-1). The sheets are further linked into a three-dimensional supra­molecular network via classical O—H...O hydrogen bonds involving the nitrate anions and coordinating water mol­ecules. Intra­molecular O—H...O hydrogen bonding is also observed. The non-coordinating nitrate O atoms are disordered over two sets of sites with occupancies of 0.57 (7) and 0.43 (7).