INFLUENCE OF AN EXTERNAL MAGNETIC-FIELD ON THE ELECTROCHEMICAL-BEHAVIOR OF ORTHO, META AND PARA NITROBENZALDEHYDES AND NITROBENZOIC ACIDS IN WATER-DIOXANE SOLVENT

The electrochemical behaviour of ortho, meta, para nitrobenzaldehydes and nitrobenzoic acids under the influence of a magnetic field (B = 0. 45 Tesla) was examined using cyclic voltammetry. The electroreduction yield was estimated by the electric charges evolved during each cycle. It was observed that the application of the magnetic field induces an enhancement of the -NO2 group electroreduction. These yields of elect roreduction seems to depend on the position of the electron withdrawin g group: -CHO and -COOH. Two main influences are outlined: the magneto hydrodynamic effect and the magnitude of the dipole moment of each nit ro compound. The case of nitrobenzoic acids appears to be more complic ated because the molecular and ionic forms coexist at pH 5.5. (C) 1997 Elsevier Science Ltd.