Cu (II) And Ag (I) Complexes of Schiff Base Derived from 2-Hydroxy-5-nitrobenzaldehyde with o- Aminobenzenethiol Synthesis, Characterization And Anti-Corrosion Behaviour Study

Abstract

A Schiff base ligand was synthesized through the reflux reaction between 2-hydroxy-5-nitrobenzaldehyde and o-aminobenzenethiol in a 1:1 molar ratio, resulting in the formation of a novel compound. New copper (II) and silver (I) complexes from this ligand were synthesized also by the reflux reaction between the synthesized ligand and Cu(II) and Ag(I) salts in 1:1 molar ratio (metal: ligand). The coloured synthesised complexes were characterized by ¹HNMR, ¹³CNMR, mass spectra, FTIR, UV-Visible and molar conductivity techniques. In this work the synthesized ligand acts as a tridentate ligand coordinate with the metal ions through its imine, hydroxyl and the thione groups. The structure of both complexes is estimated from the mass spectra which suggest the octahedral and tetrahedral chemical structures of copper (II) and silver (I) complexes respectively. The anticorrosive properties of the synthesized compounds were investigated using an electrochemical corrosion cell, with experiments conducted at two different temperatures (298 K and 308 K) and two varying concentrations (0.01 M and 0.05 M) for each compound. Both complexes show a higher anti- corrosion activity (92%) in comparison with the ligand (90%).