Poly[[μ-aqua-bis­(μ-4,4′-bipyridine-κ(2) N:N′)bis­(μ-3-hy­droxy­adamantane-1-carboxyl­ato-κ(2) O:O′)bis­(3-hy­droxy­adamantane-1-carboxyl­ato-κO)dicobalt(II)] hepta­hydrate]

The title coordination compound, {[Co(C(11)H(15)O(3))(4)(C(10)H(8)N(2))(2)(H(2)O)]·7H(2)O}(n), consists of a pair of Co(II) atoms, four 3-hy­droxy­adamantane-1-carboxyl­ate anions (L), one water mol­ecule, two bridging 4,4′-bipyridine (4,4′-bpy) ligands and seven uncoordinated water mol­ecules. Both of the Co(II) ions are coordinated in a distorted octa­hedral geometry. Four L ligands bind to each pair of Co(II) atoms in a plane, two of which bridge the two Co(II) atoms as bidentate groups while the other two coordinate to a single Co(II) atom in a monodentate mode. Two half-mol­ecules of 4,4′-bipyridine coordinate the Co(II) atoms from the upside and underside. The packing features extensice O—H⋯O hydrogen bonding.