Diaquabis(4-formylbenzoato-κO1)bis(nicotinamide-κN1)cobalt(II)

Abstract

In the title complex, [Co(C8H5O3)2(C6H6N2O)2(H2O)2], the CoII cation is located on an inversion center and is coordinated by two 4-formylbenzoate (FB) anions, two nicotinamide (NA) ligands and two water molecules. The four O atoms in the equatorial plane around the CoII cation form a slightly distorted square-planar arrangement, while the slightly distorted octahedral coordination is completed by the two N atoms of the NA ligands in the axial positions. The dihedral angle between the carboxylate group and the adjacent benzene ring is 23.91 (9)°, while the pyridine and benzene rings are oriented at a dihedral angle of 88.84 (4)°. The coordinating water molecule links with the carboxylate group via an intramolecular O—H...O hydrogen bond. In the crystal, N—H...O, O—H...O and weak C—H...O hydrogen bonds link the molecules into a three-dimensional supramolecular network. π–π stacking between the parallel benzene rings of adjacent molecules [centroid–centroid distance = 3.8505 (8) Å] may further stabilize the structure. A weak C—H...π interaction also occurs in the crystal.