Poly[[diaqua­(μ-4,4′-bipyridine N,N′-di­oxide-κ(2) O:O′)(μ-terephthalato-κ(2) O (1):O (4))cobalt(II)] 4,4′-bipyridine N,N′-dioxide monosolvate]

In the title compound, {[Co(C(8)H(4)O(4))(C(10)H(8)N(2)O(2))(H(2)O)(2)]·C(10)H(8)N(2)O(2)}(n), the Co(II) atom, lying on an inversion center, is hexa­coordinated in a distorted octa­hedral geometry defined by two O atoms from two terephthalate (tp) ligands, two O atoms from two 4,4′-bipyridine N,N′-dioxide (bpydo) ligands and two water mol­ecules. The coordinated tp and bpydo ligands and uncoordinated bpydo mol­ecule all have an inversion center. The Co(II) atoms are connected by the tp and bpydo ligands into a layer parallel to (111). In the crystal, O—H⋯O hydrogen bonds link the uncoordinated bpydo mol­ecules and the layers into a three-dimensional supra­molecular structure. Intra­layer O—H⋯O hydrogen bonds and π–π inter­actions [centroid-to-centroid distances = 3.6643 (13) and 3.8048 (13) Å] are also observed.