Hexakis(1H-imidazole-κ3)manganese(II) triaquatris(1H-imidazole-κN3)-manganese(II) bis(naphthalene-1,4-dicarboxylate)

In the crystal structure of the title compound, [Mn(C3H4N2)(6)]-[Mn(C3H4N2) (3)(H2O)(3)](C12H6O4)(2), there are uncoordinated naphthalenedicarboxylate dianions and two kinds of Mn-II complex cations, both assuming a distorted octahedral geometry. One Mn-II cation is located on an inversion center and is coordinated by six imidazole molecules, while the other Mn-II cation is located on a twofold rotation axis and is coordinated by three water molecules and three imidazole units. The naphthalenedicarboxylate dianions are linked to both Mn-II complex cations via O-H center dot center dot center dot O and N-H center dot center dot center dot O hydrogen bonding, but no pi-pi stacking is observed between aromatic rings in the crystal structure.