Summary
Non-homoleptic, octahedral cobalt(III) complexes are formed by the aerial oxidation of cobalt(II) salts in the presence of either (anti)-furfuraldoxime (HL1) or salicylaldoxime (HL2) and imidazole. The analytical data, electrical conductance, electronic, vibrational and n.m.r. (1H and13C) spectra as well as magnetic susceptibility and thermal decomposition measurements have been employed to deduce the stoichiometry and stereochemistry of the complexes. The oximes are bonded as bidentate chelates occupying the planar positions and the complexes havetrans-octahedral geometry with the imidazole and an anion in the axial positions. The thermogravimetric analysis of the complexes indicate their thermal stability at ambient temperatures, and with the increase in temperature they lose the ligands in discrete steps forming polymeric intermediates, and Co3O4 as the ultimate end product above 500°C.
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Mohapatra, M., Dash, K.C. Axial ligation of imidazole to cobalt(III) oximes. Transition Met Chem 12, 358–361 (1987). https://doi.org/10.1007/BF01024035
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DOI: https://doi.org/10.1007/BF01024035