Poly[di-μ(2)-aqua-μ(5)-(pyridine-2,6-dicarboxyl­ato)-μ(3)-(pyridine-2,6-dicarboxyl­ato)-cobalt(II)disodium]

In the title compound, [CoNa(2)(C(7)H(3)NO(4))(2)(H(2)O)(2)](n), the Co(II) atom is coordinated by two pyridine N atoms and four carboxyl­ate O atoms from two doubly deprotonated pyridine-2,6-dicarboxyl­ate ligands in a distorted octa­hedral geometry. One Na(+) cation is coordinated by three carboxyl­ate O atoms and two water mol­ecules and the other is coordinated by five carboxyl­ate O atoms and two water mol­ecules in an irregular geometry. The bis­(pyridine-2,6-dicarboxyl­ato)cobalt complex units are connected by Na(+) cations and bridging water mol­ecules into a three-dimensional coordination network. O—H⋯O hydrogen bonds are formed between the water mol­ecules and the carboxyl­ate O atoms.