The kinetics of the oxidation of a number of substituted tris-(1,10-phenanthroline) complexes of iron(II) by cobatt(III) in perchloric acid have been investigated by the use of a flow technique. The results are compared with other oxidation-reduction reactions involving the iron(II)-phenanthroline complexes. It was found that the oxidation of the mixed-ligand complexes proceeds more rapidly than the oxidation of the complexes containing identical ligands. The results are discussed in the light of the Marcus theory of electron-transfer reactions.
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Campion et al. (1964) studied this question.