Poly[[diaqua-μ(4)-pyrazine-2,3-dicarboxyl-ato-κN,O:O:O,O:O-strontium(II)] monohydrate].

In the title compound, {[Sr(C(6)H(2)N(2)O(4))(H(2)O)(2)]·H(2)O}(n), the Sr(II) ions are bridged by the pyrazine-2,3-dicarboxyl-ate ligands with the formation of two-dimensional polymeric layers parallel to the ac plane. Each Sr(II) ion is eight-coordinated by one N and five O atoms from the four ligands and two water mol-ecules. The coordination polyhedron is derived from a penta-gonal bipyramid with an O atom at the apex on one side of the equatorial plane and two O atoms sharing the apical site on the other side. The coordinated and uncoordinated water mol-ecules are involved in O-H⋯O and O-H⋯N hydrogen bonds, which consolidate the crystal structure.