cyclo-Tetra­kis(μ-naphthalene-1,8-dicarboxyl­ato)tetra­kis­[diaqua­(2,2′-bipyridine)­manganese(II)] tetra­hydrate

In the title centrosymmetric tetra­nuclear complex, [Mn(4)(C(12)H(6)O(4))(4)(C(10)H(8)N(2))(4)(H(2)O)(8)]·4H(2)O, two independent Mn(II) ions are coordinated in a slightly disorted octa­hedral environment by two aqua ligands, two naphthalene-1,8-dicarboxyl­ate (1,8-nap) ligands and one bis-chelating 2,2′-bipyridine (2,2′-bipy) ligand. In the crystal, mol­ecules are linked by inter­molecular O—H⋯O hydrogen bonds into chains along [100]. These chains are further linked by weak π–π inter­actions with centroid–centroid distances in the range of 3.609 (2)–3.758 (1) Å, forming a three-dimensional supra­molecular network.