Elucidating the mode of action of a corrosion inhibitor for iron

摘要: Two polymetallic iron(III) complexes 1 and 2 have been synthesised from the known corrosion inhibitor 3-(4-methylbenzoyl)-propionic acid HL1 their crystal structures determined. Coordination geometries extracted these used as basis for molecular modelling onto idealised oxide surfaces an aid to understanding efficacy of inhibitors 4-keto type. The proposed mode action involves 1,3-bridging didentate coordination carboxylate function L1 two FeIII ions, hydrogen-bond formation between group a bridging surface hydroxy group, well close packing aromatic end groups, which should generate hydrophobic barrier on surface. Adsorption isotherm experiments compare strengths binding related carboxylic acids indicate that presence leads significantly more stable complexes.