catena-Poly[[[diaqua­bis(8-hydroxy­quinoline N-oxide-κO (1))cobalt(II)]-μ-2,5-dimethyl­pyrazine 1,4-dioxide-κ(2) O (1):O (4)] bis­(perchlorate)]

In the title complex, {[Co(C(6)H(8)N(2)O(2))(C(9)H(7)NO(2))(H(2)O)(2)](ClO(4))(2)}(n), the Co(II) ion lies on an inversion centre and is coordinated in a slightly distorted octa­hedral environment. The 2,5-dimethyl­pyrazine 1,4-dioxide ligand, which also lies on an inversion center, acts as a bridging ligand, linking symmetry-related Co(II) ions [Co⋯Co = 8.669 (3) Å] and forming one-dimensional chains along the b axis. In the crystal structure, these chains are linked by inter­molecular aqua–perchlorate O—H⋯O hydrogen bonds, forming two-dimensional layers which are in turn connected into a three-dimensional network via π–π stacking inter­actions between quinoline rings, with a centroid–centroid distance of 3.580 (3) Å. An intermolecular O—H⋯Cl inter­action is also present.