Diaquabis( N , N -diethylnicotinamide-κ N 1 )bis[4-(dimethylamino)benzoato-κ O ]nickel(II)

The centrosymmetric title NiII complex, [Ni(C9H10NO2)2(C10H14N2O)2(H2O)2], contains two dimethylaminobenzoate (DMAB), two diethylnicotinamide (DENA) ligands and two water molecules, all of them monodentate. The four O atoms in the equatorial plane around the NiII atom form a slightly distorted square-planar arrangement, while the slightly distorted octahedral coordination is completed by the two pyridine N atoms of the DENA ligands in axial positions. The NiII atom is displaced by 0.681 (1) Å out of the least-squares plane of the carboxylate group. The dihedral angle between the carboxylate group and the adjacent benzene ring is 5.61 (7)°, while the pyridine and benzene rings are oriented at a dihedral angle of 73.20 (4)°. An intramolecular O—H...O hydrogen bond results in the formation of a six-membered ring with a twisted conformation. In the crystal structure, intermolecular O—H...O and C—H...O hydrogen bonds link molecules into a three-dimensional network. Two weak C—H...π interactions are also present.