The triclinic unit cells of the title compound with dimensions a=6.5654(7) A, b=8.5660(10) A, c=10.5675(12) A, a=77.091(8)° b=78.230(8)°, g=68.468(7)°, v=533.96(10)A3, contain two pyrazindicarboxilate icons, four water moleculs, one copper(II) ion and a piperazinium dipositive icone. The metallic icons lie on inversion centres of the p-1space group. Each Cu(II) is on a octahedral coordinations environment with two o atoms in the axial positions.
