Bis[tetra­aqua­(1,10-phenanthroline-κ(2) N,N′)cobalt(II)] hexa­aqua­cobalt(II) bis­[3,5-bis­(carboxyl­atometh­oxy)benzoate] tetra­hydrate

The title compound, [Co(C(12)H(8)N(2))(H(2)O)(4)](2)[Co(H(2)O)(6)](C(11)H(7)O(8))(2)·4H(2)O, was obtanied by the reaction of cobalt acetate with 3,5-bis­(carb­oxy­meth­oxy)benzoic acid and 1,10-phenanthroline. The asymmetric unit contains one tetra­aqua­(1,10-phenanthroline)cobalt(II) cation, one half of a hexa­aqua­cobalt(II) cation that is completed by inversion symmetry, one 3,5-bis­(carboxyl­atometh­oxy)benzoate trianion and two lattice water mol­ecules. The two Co(II) atoms each show a slightly distorted octa­hedral coordination (CoO(6) and CoO(4)N(2)). The cations, anions and lattice water mol­ecules are linked by an intricate network of O—H⋯O hydrogen bonds into a three-dimensional structure.