SYNTHESIS AND CRYSTAL STRUCTURE OF COBALT(III) COMPLEXES WITH SUBSTITUTED 2-[(BENZIMIDAZOLE-1-YL) IMINOMETHYL]PHENOLS

Two Co(III) complexes are synthesized based on 2-{(E)-[2-(hydroxy(alkyl)amino)benzimidazole-1-yl]iminomethyl}phenol (H 3 L 1 and H 3 L 2 , alkyl is ethyl or propyl). By the elemental analysis and IR spectroscopy it is established that the obtained complexes have the compositions [Co(H 2 L 1 )(HL 1 )]·2C 2 H 5 OH and [Co(H 2 L 2 )(HL 2 )]CH 3 OH·1/2H 2 O. Their crystal and molecular structures are determined by single crystal X-ray diffraction (XRD). From the XRD data it is found that the complexes crystallize in the triclinic space group as solvates with alcohol and water molecules. In mononuclear molecules of both complexes, two trischelate ligands in mono- and dianionic forms are coordinated to the Co(III) cation. The coordination environment of the cobalt atom CoN 4 O 2 corresponds to a distorted octahedron in both compounds.