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PHOTOOXIDATION OF MAGNESIUM TETRAPHENYLPORPHYRIN IN THE PRESENCE OF METHYL VIOLOGEN
Author(s) -
Rieger Anne L.,
Edwards John O.,
Levey Gerrit
Publication year - 1983
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1983.tb03852.x
Subject(s) - tetraphenylporphyrin , chemistry , photochemistry , viologen , absorbance , magnesium , photodissociation , methanol , oxygen , superoxide , porphyrin , organic chemistry , chromatography , enzyme
— A study of the photooxidation of magnesium tetraphenylporphyrin by oxygen in methanol with methyl viologen present has been carried out. The reaction was normally followed by the decrease of Soret band absorbance with time. The influences of air, methyl viologen, light wavelength and intensity, presence of ß‐carotene, pH, and MgTPP concentration were investigated. From bulk photolysis experiments, three products have been separated and partially characterized. A mechanism based on superoxide as the dominant oxidant is proposed.