Voltammetric study on the complexes of the rare earths with tetraphenylporphyrin

Fifteen rare earth-tetraphenylporphyrin (RE-TPP) complexes were directly prepared by mixing equal molar concentrations of RE(ClO4)3 and H2TPP in acetone media. The electrochemical behaviors of these complexes and the influence of dissolved oxygen were investigated by voltammetry. Althrough there are some difference between the behaviors of light and heavy rare earth-porphyrins, the central RE ions of the all fifteen complexes were reduced from tervalent to divalent state, meanwhile the dissovled oxygen was reduced as superoxide ion O2, which readily combined with the complex forming peroxide additive complex such as RE-TPP??O22-.EI04257-2621