Synthesis, characterization and antioxidative activity of lanthanide complexes with genistein

Six genistein lanthanide complexes, LnL(2) (OAc) . nH(2)O [Ln = La(III), Sm(III), Eu(III), Gd(III), Tb (III), Dy (III); L = genistein; n = 4, 7, 8] were synthesized and characterized on the basis of elemental analyses, IR, H-1 NMR spectra and molar conductivity. The scavenging activity of genistein and five lanthanides complexes on the hydroxyl free radicals (OH.) was also investigated by spectrophotometric methods. The results show that the scavenging activity of the complexes is better than that of the ligand and their scavenging ability can be assembled in the following order: Sm > La > Dy > Eu > Th > L.