Development of oxidation reaction system using vesicles as generation site of singlet oxygen

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Photooxydation reaction system for organic substrates by visible-light irradiation were developed from phospholipid vesicles containing antimony tetraphenylporphyrin complexes. Sb complexes containing axial alkyl ligand adsorbed on the vesicles with a high binding constants. Photooxidation reaction of 9,10-dimethylanthrathen as a target molecule was studied and the reaction mechanism was analyzed. When the Sb complex and the target coexisted in one vesicle, the oxidation reaction proceed efficiently via photoinduced electron transfer. When both were existed on vesicles separately, the reaction proceed via generation of singlet oxygen.