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Substituent effect on the redox potential ofmeso-substituted octaethylporphyrins and their zinc and copper complexes

Authors
Journal
Tetrahedron
0040-4020
Publisher
Elsevier
Publication Date
Volume
46
Issue
9
Identifiers
DOI: 10.1016/s0040-4020(01)85461-2

Abstract

Abstract meso -Substituent effect on the redox properties of octaethylporphyrin and its zinc(II) and copper(II) complexes are investigated with cyclic volatmmetry. The E 1 2 , values were observed to correlate linearly with Hammett's σ p constant for the first and second oxidation reaction and the first reduction reaction in the metallo-OEP series, with ρ values an order of magnitude larger than that of the TPP series. For the free base OEP series, steric effect has to be taken into consideration when discussing the meso -substituent effect of OEP's in addition to electronic effect.

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