Poly[[hemi-μ(4)-oxalato-hemi-μ(2)-oxalato-bis­(μ(3)-pyrazine-2-carboxyl­ato)neodymium(III)silver(I)] monohydrate]

In the title coordination polymer, {[AgNd(C(5)H(3)N(2)O(2))(2)(C(2)O(4))]·H(2)O}(n), the Nd(III) atom is coordinated in a distorted monocapped square-anti­prismatic geometry by two O and two N atoms of two N,O-bidentate pyrazine-2-carboxyl­ate (2-pzc) ligands, four O atoms of two bidentate oxalate ligands, and one O atom of a monodentate carboxyl­ate group of a 2-pzc ligand. The Ag(I) ion is coordinated in a distorted tetra­hedral geometry by two N atoms from two monodentate 2-pzc ligands, one O atom from one monodentate oxalate ligand and one O atom of a bridging carboxyl­ate group of a 2-pzc ligand. The oxalate anions link neighbouring neodymium(III) metal centres into Nd–oxalate chains, which are inter­connected by Ag(2-pyz)(2) units, forming a three-dimensional polymeric framework. Inter­molecular O—H⋯O and C—H⋯O hydrogen bonds are observed in the crystal structure.