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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.

acta crystallographica. section e

Poly[[diaqua(μ-4,4′-bipyridineN,N′-dioxide-κ2O:O′)(μ-terephthalato-κ2O1:O4)cobalt(II)] 4,4′-bipyridineN,N′-dioxide monosolvate]