Two novel heteroligand o-semiquinonato-formazanato cobalt complexes [Co(3,6-SQ)(Form)] (1) and [Co(3,6-SQ)2(Form)] (2) (3,6-SQ is 3,6-di-tert-butyl-o-benzosemiquinonate radical anion; Form is 1,3,5-triphenylformazanate anion) were synthesized and characterized in detail. The molecular structures of [Co(3,6-SQ)(Form)] and [Co(3,6-SQ)2(Form)] were determined by X-ray analysis. Magnetic susceptibility measurements and spectroscopic studies have shown that square-planar complex 1 is diamagnetic with a residual paramagnetism due to antiferromagnetic exchange metal-ligand. Complex 2 includes cobalt(III) in the low-spin state and two anionic-radical o-semiquinonato and one formazanate ligand.

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The complex of triphenylantimony(V) 3,6 di tert butylcatecholate with 5 (2,6 dimethyl phenyl) 3 (4 pyridyl) 1 phenylformazan was synthesized and characterized by spectroscopic and electrochemical methods and by X ray diffraction. In the crystal structure, there are inter molecular hydrogen bonds between the formazan ligands of adjacent molecules. The electro chemical transformations of the complex were investigated by cyclic voltammetry. It was shown that both the formazan and catecholate moieties are involved in redox processes.

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