SOLVENT EFFECT ON THE STRUCTURES OF Co (II) SCHIFF BASE COMPLEXES DERIVED FROM 4-AMINOANTIPYRINE ...

The title complexes are made by reacting Schiff bases L1H or L2H with cobalt thiocyanate or cobalt azide in various coordinated solvents to produce solid compounds ranging in colour from red to dark green to greenish red to olive green, depending on the solvent and kind of cobalt salt used. These complexes have a binuclear structure with a coordination number of six around each cobalt atom, according to UV-Vis and IR spectra.

Methanol may easily substitute the solvents EtOH, THF, CH3CN, and MeOH, which are coupled to the cobalt atom in the axial position transto either isothiocyanate or azide ligands, to generate red complexes. In reality, all of the complexes are soluble in methanol, with the exception of the dark green complexes, which are soluble in some organic solvents such as acetone and acetonitrile. The cobalt (II) complexes investigated in this study are solvent dependent.

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