Light-harvesting energy transfer and subsequent electron transfer of cationic porphyrin complexes on clay surfaces.
A novel energy-transfer system involving nonaggregated cationic porphyrins adsorbed on an anionic-type clay surface and the electron-transfer reaction that occurs after light harvesting are described. In the clay-porphyrin complexes, photochemical energy transfer from excited singlet zinc porphyrins to free-base porphyrins proceeds. The photochemical electron-transfer reaction from an electron donor in solution (hydroquinone) to the adsorbed porphyrin in the excited singlet state was also examined. Because the electron-transfer rate from the hydroquinone to the excited singlet free-base porphyrin is larger than that to the excited singlet zinc porphyrin, we conclude that the energy transfer accelerates the overall electron-transfer reaction.
Takagi
Shinsuke
S
Department of Applied Chemistry, Faculty of Urban Environmental Sciences, Tokyo Metropolitan University, Minami-ohsawa 1-1, Hachiohji, Tokyo 192-0397, Japan.
Eguchi
Miharu
M
Tryk
Donald A
DA
Inoue
Haruo
H
D000538:Aluminum Silicates / Q000737:chemistry*; D000077215:Clay; D004579:Electron Transport; D004583:Electrons; D006873:Hydroquinones / Q000737:chemistry*; D010777:Photochemistry; D011166:Porphyrins / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
D000538:Aluminum Silicates; D006873:Hydroquinones; D011166:Porphyrins; D015032:Zinc; D000077215:Clay; C031927:hydroquinone