Redox Reaction of the Central Metal Ions Coordinated to Tetra(p-sulfophenyl)porphine (TPPS). II. Photoreduction of [Fe(III)TPPS]2O by Ethanol

Iron(III) ion coordinated to TPPS was reduced to the divalent ion by ethanol on illumination of light. The reaction rates appear to obey the half-order kinetic of the metalloporphyrin in the buffered solutions of pH 7 to 11. A possible reaction mechanism is discussed.