A two-dimensional Cd(II) coordination polymer: poly[di­aqua­[μ(3)-5,6-bis­(pyridin-2-yl)pyrazine-2,3-di­carboxyl­ato-κ(5) O (2):O (3):O (3),N (4),N (5)]cadmium]

The reaction of 5,6-bis­(pyridin-2-yl)pyrazine-2,3-di­carb­oxy­lic acid with cadmium dichloride leads to the formation of the title two-dimensional coordination polymer, [Cd(C(16)H(8)N(4)O(4))(H(2)O)(2)](n). The metal atom is sevenfold coordinated by one pyrazine and one pyridine N atom, two water O atoms, and by two carboxyl­ate O atoms, one of which bridges two Cd(II) atoms to form a Cd(2)O(2) unit situated about a centre of inversion. Hence, the ligand coordinates to the cadmium atom in an N,N′,O-tridentate and an O-monodentate manner. Within the polymer network, there are a number of O—H⋯O hydrogen bonds present, involving the water mol­ecules and the carboxyl­ate O atoms. There are also C—H⋯N and C—H⋯O hydrogen bonds present. In the crystal, the polymer networks lie parallel to the bc plane. They are aligned back-to-back along the a axis with the non-coordinating pyridine rings directed into the space between the networks.