Preparation , Spectral Characterization and anti Corrosion Property of new azo- azomethine ligand and its Chelate complexes for Carbon Steel in Acid Solution

Abstract

             Anew azo–Schiff base ligand(4-((E)-(3-iodophenyl)diazenyl)-2-((3-(trifluromethyl) phenyl imino)methyl) phenol (IFPMP) was prepaered by condensation of ((E)2-hydroxy-5-((3-iodophenyl) diazenyl) benzaldehyde with 3- (trifluromethyl)aniline .This azo-azomethine ligand was reacted with some transition metal ions such as Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) forming seven chelate complexes . The structural features have been arrived from their C.H.N elemental analysis ,FT-IR , UV-Vis , ¹HNMR , Mass spectra, magnetic moment measurement and molar conductance. The data show that complexes have the composition of [M(L)₂(H₂O)₂] for all chelate complexes except of Cr(III) and Fe(III) which were found that the composition as [M(L)₂Cl(H₂O)] .Based on this data we propose octahedral geometry for all metal complexes. The influence of the prepared new ligand and its chelate complex on the corrosion inhibition of carbon steel in (0.5M) HCl solution was studied by weight loss. Results show that maximum inhibition efficiency of 47.8% is afforded by the studied concentration of the ligand (4ppm) at 298K , while the maximum inhibition efficiency of its ligand complex is 29.5% by (20ppm) at 298K from weight loss method measurements.