摘要:
The efficiency of the photosensitized generation of singlet oxygen (O-1(2)) with meso-phenyl substituted tetrabenzoporphyrin metallo complexes as sensitizer was determined from the limiting quantum yield of the (+)-limonene photooxygenation and compared with that of hematoporphyrin (HP), which has been known to serve as an effective sensitizer, using a He-Ne laser light (633 mm). Among the diamagnetic (Mg, Zn, and Cd) complexes treated here, the Zn complexes were most efficient for the (+)-limonene photooxygenation with the limiting quantum yields of PHI(-A) = 0.4. This result was comparable to that of HP. The direct observation of the intensity of O-1(2) emission by the laser flash photolysis technique supported these results.