AN ELECTROCHEMICAL STUDY OF LONG-CHAIN ALIPHATIC-AMINES

Cyclic voltammetry has been applied in the study of the behaviour of long-chain aliphatic amines at the interface between two immiscible electrolyte solutions. The organic phase was 1,2-dichloroethane, which has a relatively low relative permittivity resembling those of solvents used in extraction processes. For the oil-soluble amine hydrochlorides the stability constants were evaluated after the estimation of the standard Gibbs energy of transfer of the hydrogen ion. Assisted ion transfer explained the behaviour of the oil-soluble amines at high pH values, but at low values results gave evidence for Cl- ion transfer across the interface. For the water-soluble amine hydrochloride the results were in reasonable accordance with earlier observations.