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 (H3L1 and H3L2, alkyl is ethyl or propyl). By the elemental analysis and IR spectroscopy it is established that the obtained complexes have the compositions [Co(H2L1)(HL1)]·2C2H5OH and [Co(H2L2)(HL2)]CH3OH·1/2H2O. 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 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$P\bar{1}$$\end{document} 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 CoN4O2 corresponds to a distorted octahedron in both compounds.