Fatty acids linked with dyes and corrosion inhibitors

Abstract

4-Hydroxy- and 4,4′-dihydroxyazobenzene have been linked to methyl oleate by hydroxylation with singulett oxygen and Mitsunobu-reaction. The oleate-dye conjugates exhibit low critical micelle concentrations (10-5 to 10-7mol/l), a large reduction of the surface tension (29 to 31 mN/m at cmc) and can dye a nonpolar fiber from aqueous solution. Reaction of methyl epoxystearate and -undecanoate with imidazole, mercaptobenzothiazole and triazole affords fatty acid, corrosion inhibitor conjugates. In an electrochemical test by cyclovoltammetry these conjugates exhibit a better inhibiting efficacy than mixtures of the components.