Disorder in the anionic part of catena-poly[[(pyrazine-2-carboxyl­ato)copper(II)]-μ-pyrazine-2-carboxyl­ato]

The title compound, [Cu(C₅H₃N₂O₂)_0.88(C₆H₄NO₂)_1.12]_n, is characterized by disorder of the anion, resulting from a statistical occupation in a 0.44 (3):0.56 (3) ratio of pyrazine-2-carboxylate and pyridine-2-carboxylate. The compound was isolated during attempts to synthesize a mixed-ligand coordination polymer by solvothermal reaction between copper(II) nitrate and equimolar mixtures of pyrazine-2-carboxylic acid and pyridine-2-carb­oxy­lic acid in a mixture of water and EtOH. The difference in the two components of the compound is due to substitutional disorder of a CH group for one of the N atoms of the pyrazine ring which share the same site in the structure. In the crystal structure, the Cu^II atom lies on an inversion centre and is six-coordinated in a distorted N₂O₄ geometry. The carboxyl­ate group carbonyl O atoms are weakly coordinated to an equivalent Cu^II atom that is translated one unit cell in the a-axis direction, thus forming a polymeric chain through carboxyl­ate bridges.