Poly[diaqua(μ(2)-oxalato-κ(4) O (1),O (2):O (1′),O (2′))(μ(2)-pyrazine-2-carboxyl­ato-κ(3) N (1),O:O′)cerium(III)]

In the hydro­thermally synthesized title compound, [Ce(C(5)H(3)N(2)O(2))(C(2)O(4))(H(2)O)(2)](n), the Ce(III) ion is coordinated by four O atoms from two different oxalate ligands, three O atoms from two symmetry-related pyrazine-2-carboxyl­ate ligands, two O atoms from two water melecules and one N atom from a pyrazine-2-carboxyl­ate ligand in a distorted bicapped square-anti­prismatic coordination geometry. The oxalate and pyrazine-2-carboxyl­ate ligands bridge the Ce(III) ions, forming a two-dimensional structure. In addition, inter­molecular O—H⋯O and O—H⋯N hydrogen bonds connect the two-dimensional structure into a three-dimensional network.