Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.003 Å; R factor = 0.030; wR factor = 0.063; data-to-parameter ratio = 16.8.The reaction of cadmium nitrate dihydrate, propane-1,2-diamine and pyridine-2,6-dicarboxylic acid in a 1:1:2 molar ratio in an aqueous solution resulted in the formation of the title compound, (C 3 2 O (where p-1,2-da is propane-1,2-diamine and pydcH 2 is pyridine-2,6-dicarboxylic acid). The Cd II ion is coordinated by four O and two N atoms of two pydc ligands in a distorted octahedral environment. The structure also contains two uncoordinated water molecules. In the crystal, there are several intermolecular N-HÁ Á ÁO, O-HÁ Á ÁO and weak C-HÁ Á ÁO hydrogen bonds. There are also -stacking interactions between the pyridine rings of pydc units, with centroid-centroid distances of 3.4708 (16) Å . Related literature