trans-Diaquabis(3-hydroxybenzoato-O)bis-(nicotinamide-N 1)cobalt(II)

Article abstract of DOI:10.1107/S0108270199006733

The title compound, [Co(C₇H₅O₃)₂(C₆H ₆N₂O)₂(H₂O)₂], is a monomeric and centrosymmetric cobalt complex. It contains two 3-hydroxybenzoate anions, two nicotinamide (NA) molecules and two water molecules as ligands. Each ligand is monodentate. The two nearest carboxylate O atoms and the two water O atoms form a slightly distorted square-planar arrangement around the Co atom [with distances of 2.099 (3) and 2.132 (3) A, respectively], while the distorted octahedral coordination is completed by the pyridine N atoms of the NA ligands at a distance of 2.139 (4) A. There is an intramolecular hydrogen bond between the nicotinamide N and O atoms [N...O 2.228 (6) A], and the hydroxybenzoate and water O atoms form inter- [2.662 (5) A] and intramolecular [2.586 (5) A] hydrogen bonds, respectively, with the non-coordinated O atom of the carboxylate group.