Diaquabis(4-methoxybenzoato-κO)bis(nicotinamide-κN1)nickel(II) dihydrate

In the mononuclear title compound, [Ni(C8H7O3)2(C6H6N2O)2(H2O)2]·2H2O, the NiII ion is located on a crystallographic inversion center. The asymmetric unit further contains one 4-methoxybenzoate anion, one nicotinamide (NA) ligand and one coordinated and one uncoordinated water molecule; all ligands are monodentate. The four O atoms in the equatorial plane around the NiII 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 7.2 (1)°, while the pyridine and benzene rings are oriented at a dihedral angle of 72.80 (4)°. An intramolecular 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.