Abstract

Aby Paul, K. Joby Thomas*, Vinod P. Raphael and K. S. Shaju

A novel Schiff base derived from 3-formylindole and 2-aminobenzoic acid and it’s Mn(II), Ni(II) and Cu(II) transition metal complexes were synthesized. Structure of the ligand and complexes were derived on the basis of various analytical techniques such as ¹Hnmr, ¹³Cnmr, infrared, mass and electronic spectroscopy, elemental, magnetic and electrical studies. The corrosion inhibition capacity of the Schiff base on mild steel was screened by Electronic Impedance Spectroscopy (EIS). Investigations showed that the Schiff base act as a good corrosion inhibitor even at low concentrations. The adsorption of inhibitor on the surfaces of mild steel obeys Langmiur isotherm. Thermodynamic parameters (K_ADS,  and DELTA;G⁰_ADS) were calculated using Langmiur adsorption isotherm.

3-formylindole; 2-amino benzoic acid; transition metal complexes; EIS

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