Poly[copper(II)-mu-pyrazine-mu(3)-squarato]

In the structure of the title compound, [Cu(C4O4)(C4H4N2)](n), each copper cation is surrounded by three squarate (3,4-dihydroxy-3-cyclobutene-1,2-dio ate) anions and two pyrazine ligands, all of which are located in special p ositions. The copper cation and all atoms of the squarate anion are located on a mirror plane, whereas the pyrazine ligand is located around a mirror plane which is perpendicular to the ring plane. The cations are connected v ia the squarate anions and the pyrazine ligands, forming sheets parallel to (001).