Tris[N-(4-fluorophenyl)pyridine-2-carboxamidato-kappa2N,N']cobalt(III) trihydrate: a novel meridional complex.

Abstract

The title complex, [Co(C(12)H(8)FN(2)O)(3)].3H(2)O, 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) degrees. The Co-N(py) distances [1.9258 (16)-1.9656 (17) A] are shorter than the corresponding Co-N(amide) distances [1.9372 (17)-1.9873 (15) A]. In addition, the Co-N(py) distances are closely related to the magnitudes of the chelate angles, a shorter Co-N(py) 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.