catena-Poly[[[triaqua­copper(II)]-μ(2)-pyrazine-2,3-dicarboxyl­ato] monohydrate]

The Cu atom in the title complex, {[Cu(C(6)H(2)N(2)O(4))(H(2)O)(3)]·H(2)O}(n) or {[Cu(L)(H(2)O)(3)]·H(2)O}(n) (L is pyrazine-2,3-dicarbox­yl­ate), displays octa­hedral coordination formed by the ligand L and three coordinated water mol­ecules. The ligand L is tridentate, with one N atom of the pyrazine ring and one O atom of one carboxyl­ate group forming a chelate ring, whereas one O atom from the second carboxyl­ate group is coordinated to another Cu atom. The ligand L links mol­ecules to form an infinite chain parallel to the [101] direction. The chains are further linked through O—H⋯O and O—H⋯N hydrogen bonds involving the water mol­ecules to build up a three-dimensional network.