Diaqua­Bis(N,N-Diethyl­Nicotinamide-Κn1)Bis­[4-(Dimethyl­Amino)Benzoato-Κo]Nickel(II)

Abstract

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.