Radical scavenging activity of sterically hindered catecholate and o-amidophenolate complexes of LSbVPh3 type

The radical scavenging effect of the substituted catecholates (1–3, 6) and o-amidophenolates (4, 5) of triphenylantimony(V) in reactions with DPPH• radical and in a process of oleic acid peroxidation was studied in details. Complexes 1–6 show the high activity in radical scavenging reactions with DPPH• radical leading to disappearance of radical species. Complexes were demonstrated to be high-efficient inhibitors of chain-radical process of the peroxidation of oleic acid as well as the effective destructors of the formed hydroperoxides. It was found that the effectiveness of complexes studied in the inhibition of the peroxidation of oleic acid depends on the first oxidation potential of complex.