Enhanced pseudo-halide promoted corrosion inhibition by biologically active zinc(II) Schiff base complexes

Abstract

Four novel biologically significant Zn (II) Schiff base complexes ([Zn(L1)2](ClO4)2 (1), [Zn(μ-fumarate)(L1)]n (2), [ZnL1(N3)2] (3) and [ZnL2(N3)2] (4) were synthesized from two ligands L1 [N1,N1-dimethyl-N2-(1-(pyridine-2-yl)ethylidene)ethane-1,2-diamine] and L2 [N1,N1-diethyl-N2-(1-(pyridine-2-yl)ethylidene)ethane-1,2-diamine]. Detailed electrochemical polarization and impedance studies prove that corrosion inhibition activity of newly synthesized zinc complexes in 15% HCl on mild steel gets enhanced significantly due to the incorporation of psudo-halide azide as co-ligand. Different microscopic images (FE-SEM and AFM) depicted that metal surface is protected by Zn(II) complexes. Antibacterial activity of these Zn (II) azido Schiff base complexes against Gram-positive Staphylococcus aureus was studied and reported. Further, antiproliferative activities of these azido complexes were studied against breast cancer cell line MCF 7. © 2018 Elsevier B.V.