catena-Poly[[tetraaquacopper(II)]-μ-pyrazine-2-carboxamide-κ3N4:N1,O-[bis(sulfato-κO)copper(II)]-μ-pyrazine-2-carboxamide-κ3N1,O:N4]

Abstract

In the crystal of the title polymeric compound, [Cu2(SO4)2(C5H5N3O)2(H2O)4]n, two independent CuIIatoms are located on individual inversion centers. One CuIIatom is coordinated by four water molecules and two pyrazine-2-carboxamide ligands in a distorted O4N2octahedral geometry; the other isN,O-chelated by two pyrazine-2-carboxamide ligands and further coordinated by two sulfate anions in a distorted O4N2octahedral geometry. The pyrazine-2-carboxamide ligands bridge the CuIIatoms to form a polymeric chain running along [110]. The crystal structure features N—H...O, O—H...O and weak C—H...O hydrogen bonds.