trans-Diaquabis(4-fluorobenzoato-kappa O)bis(nicotinamide-kappa N-1)nickel(II)

In the mononuclear Ni-II title complex, [Ni(C7H4FO2)(2)(C6H6N2O)(2)(H2O)(2)], the Ni-II atom, located on an inversion center, is coordinated by two nicotinamide and two 4-fluorobenzoate ligands and two water molecules in a distorted N2O4 octahedral geometry. The dihedral angle between the carboxylate group and the adjacent benzene ring is 8.95 (8)degrees, while the pyridine ring and the benzene ring are oriented at a dihedral angle of 75.01 (7)degrees. The water molecule links the adjacent carboxylate O atom via an intramolecular O-H center dot center dot center dot O hydrogen bond. In the crystal, O-H center dot center dot center dot O, N-H center dot center dot center dot O, C-H center dot center dot center dot O and C-H center dot center dot center dot F hydrogen bonds link the molecules into a three-dimensional network. pi-pi stacking between parallel pyridine rings [centroid-centroid distance = 3.7287 (11) angstrom] is also observed.