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The chronopotentiometric reduction behaviour of several complexes of copper(II), palladium(I1) and rhodium(II1) has been investigated at platinum and mercury electrodes. The aquo complexes examined were shown to undergo some dissociation before reduction at the mercury electrode.With the exception of the ethylenediamine system ligand adsorption was observed on the mercury pool electrode. As a result it was possible to calculate the degree of adsorption of some of the ligands.The rate constants for the reduction of the copper complexes were measured and found to follow the same order as the polarographic reduction potentials.

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A comparison of Ep reduction potentials with the absorption spectra and transition times of the complexes has proved valuable in the investigation of the reduction of nickel(II) complexes. From the work it can be stated that as the ligand in the complex becomes stronger (in the spectrochemical sense), the complex becomes more stable towards the mercury drop in that higher negative potentials are required for reduction and the chronopotentiometric rate of reduction becomes greater.