Diaquabis-(4-methoxybenzoato-κO¹)bis-(nicotinamide- κN¹)cobalt(II) dihydrate

In the mononuclear title compound, [Co(C₈H₇O ₃)₂(C₆H₆N₂O)2(H ₂O)2]·2H₂O, the Co^II ion is located on a crystallographic inversion center. The asymmetric unit is completed by one 4-methoxy-benzoate anion, one nicotinamide (NA) ligand and one coordinated and one uncoordinated water molecule. All ligands act in a monodentate mode. The four O atoms in the equatorial plane around the Co^II ion form a slightly distorted square-planar arrangement, while the slightly distorted octahedral coordination is completed by the two pyridine N atoms of the NA ligands in the axial positions. The dihedral angle between the carboxylate group and the attached benzene ring is 6.47 (7)°, while the pyridine and benzene rings are oriented at a dihedral angle of 72.80 (4)°. An O - H⋯O hydrogen bond links the uncoordinated water molecule to one of the carboxylate groups. In the crystal structure, intermolecular O - H⋯O, N - H⋯O and C - H⋯O hydrogen bonds link the molecules into a three-dimensional network.