Poly[di-μ(2)-aqua-μ(4)-chlorido-μ(4)-(2-mercaptopyrimidine-4,6-diolato-κ(4) O:O:O′:O′)-disodium(I)]

In the title coordination polymer, [Na(2)(C(4)H(3)N(2)O(2)S)Cl(H(2)O)(2)](n), the Na(I) ion lies on a twofold rotation axis and the chloride anion on an inversion center. The Na(I) ion is six-coordinated by two O atoms from two zwitterionic 2-mercaptopyrimidine-4,6-diolate ligands (mm2 symmetry), two water O atoms (m symmetry) and two Cl atoms in a distorted octa­hedral geometry. Adjacent Na(I) ions are bridged by an olate group, a water mol­ecule and a chloride anion into a three-dimensional network. The crystal structure is further stabil­ized by N—H⋯Cl, O—H⋯O and O—H⋯S hydrogen bonds.