Ionic Charge Effect on the Reduction Potential of Inert-type Metal Complex

Abstract
Current-potential curves of various oxalato complexes of chromium (III) were obtained at the dropping mercury electrode in acid or neutral aqueous solutions. The reduction potentials that were defined as potentials at \barl=\barll⁄10 were found to shift to more negative potentials with an increasing number of oxa-lates coordinated. The ionic charge effect on the reduction potentials was discussed in connection with the electrostatic interaction between the reacting species and the electrode.