Synthesis, estimation and applications of some transition metal complexes of salicylanilide derivatives

Complexes of derivatives of 2,5-dichlorosalicylanilide with transition metal ions, Cu2+ Co2+, Ni2+, Zn2+ and Fe3+, were been prepared and studied using microanalysis, electronic, IR, H-1-NMR spectra and TGA. Thermal stability and activation energies were determined. The pK-H values of these anilides have been investigated by spectrophotometry and potentiometric methods, and the optimum conditions favouring the formation of the coloured complexes have been studied. Anilide is found to behave as an inhibitor for the corrosion of iron in acidic solutions.