The first and second oxidation potentials of meso-substituted octaethylporphyrins are observed to follow a Hammett linear free energy relationship, with the ρ values an order of magnitude higher than those obtained for meso-substituted tetrapheynlporphyrins.
H. Leung, G. Wu, W. Gan and Y. Chan, J. Chem. Soc., Chem. Commun., 1987, 20 DOI: 10.1039/C39870000020
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