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Herein we report the synthesis, characterization and antioxidant activity of the Schiff base ligands (E)-4-bromo-2-((2-piperazine-1-yl)ethylimino)methylphenol and 2,2’-(1E,1E’)-cyclohexane1,2-diylbis(azan-1-yl-1-ylidene))bismethan-1-yl-1-ylidene)bis (4-bromophenol) and their complexes of copper (II) ion. Antioxidant activities of the copper complexes were studied by ferric reducing antioxidant power (FRAP) assay according to the procedure reported by Benzie and Strain 1 which considered the reduction of ferric tripyridyl triazine complex to a ferrous complex at low pH by monitoring the change in absorption at 593nm. The overall results showed an increased in antioxidant activity with the increase in steric crowd. Similarly, the ligands show high activity than the complexes.

Influence of Steric Hindrance on The Antioxidant Activity of Some Schiff Base Ligands And Their Copper(II) Complexes