Tris[N-(4-fluorophenyl)pyridine-2-carboxamidato-k 2N,N′]cobalt(III) tri hydrate : a novel meridional complex

The title complex, [Co(C12H8FN2O) 3]·3H2O, has been synthesized for the first time. The complex comprises three bidentate ligands containing the pyridine-2-carboxamide stem. The distorted octahedral coordination around the Co atom is formed via the pyridine (py) N atom and the deprotonated amide N atom of each ligand, with the three pyridine rings in a meridional arrangement. For each ligand, the pyridine ring and the carbonyl group are nearly coplanar, with torsion angles in the range 0.4 (3)-4.8 (4)°. The Co-Npy distances [1.9258(16)-1.9656 (17) Å] are shorter than the corresponding Co-Namide distances [1.9372 (17)-1.9873 (15) Å]. In addition, the Co - Npy distances are closely related to the magnitudes of the chelate angles, a shorter Co-Npy distance corresponding to a larger angle. Five intermolecular hydrogen bonds, involving carbonyl O atoms of the ligands and lattice water molecules, lead to the formation of a mesh structure.Department of Applied Biology and Chemical Technolog