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Three new  β -benzylselenated Schiff bases,  ( S )-L 1 H ,  ( R )-L 2 H  and  ( R )-L 3 H , were synthesized from three chiral  β -benzylselenated amines,  ( S )-2a ,  ( R )-2b  and  ( R )-2c , respectively, on condensation with salicylaldehyde. The corresponding palladium complexes,  ( S )-1 ,  ( R )-2  and  ( R )-3,  were synthesized by reactions of these ligands with Na 2 [PdCl 4 ]. The ligands and their complexes were characterized by spectroscopic ( 1 H,  13 C{ 1 H} NMR and FT-IR), polarimetric and elemental analysis. The crystal structure of  ( S )-1  was determined by single-crystal X-ray diffraction. The ligands bind palladium(II) as deprotonated ( ( S )-L 1,  ( R )-L 2and  ( R )-L 3) tridentate (Se,N,O - ) chelates resulting in complexes of composition [Pd( L 1-3)Cl]. All these compounds have been screened for  in vitro  DPPH radical scavenging activity using vitamin-C as a reference standard. The DPPH radical scavenging activity was assessed by varying the concentration of each of these compounds. The results of antioxidant activity studies demonstrated that these compounds are good-to-excellent radical scavenging agents. The antioxidant activity was quantitatively expressed as their IC 50  values which revealed that the activity of palladium complexes were 50% higher than those of corresponding ligands and very close to that of the standard reference vitamin-C.

Synthesis, characterization and antioxidant activity of new β-benzylselenated Schiff bases and their palladium complexes