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Redox Properties of Tetraphenylporphyrin Complexes
Author(s) -
Wolberg Alexander
Publication year - 1974
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.197400098
Subject(s) - chemistry , tetraphenylporphyrin , redox , porphyrin , metal , photochemistry , chlorine , ligand (biochemistry) , transition metal , ion , non innocent ligand , inorganic chemistry , polymer chemistry , medicinal chemistry , organic chemistry , catalysis , biochemistry , receptor
The redox‐properties of tetraphenylporphyrin‐complexes were studied as a function of substituents on the phenyl group. Electron‐withdrawing chlorine substituents cause a rise of approximately 100 mV for the first ligand oxidation and electron‐donating methoxy‐substituents cause a decrease of about the same magnitude. The redox‐properties of the central metal ion are much less sensitive to these substituents. The Fe 3+ /Fe 2+ transition on the other hand, is seen to depend on the anion used. Taking these effects into account a tentative mechanism is proposed for the oxidation‐behaviour of μ‐oxo‐bis (tetraphenyl)porphyrin‐iron(III).