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Photosensitization of TiO2 colloid by hypocrellin B (HB),a natural photodynamic pigment with extremely high photosta-bility,has been studied by surface enhanced Raman spec-troscopy (SERS),laser flash photolysis and electron paramagnetic resonance (EPR) techniques.The photoseiisitization of TiO2 occurred practically from the excited triplet dye and the electron injection rate constant is 1.3×106 s-1.The influences of donor and acceptor on the electron injection were investigated.
Photosensitization of TiO2 colloid by hypocrellin B (HB), a natural photodynamic pigment with extremely high photosta-bility, has been studied by surface enhanced Raman spec-troscopy (SERS), laser flash photolysis and electron paramagnetic resonance (EPR) techniques. Photoseiisitization of TiO2 occurred practically from the excited triplet dye and the electron injection rate constant is 1.3 × 106 s-1. The influences of donor and acceptor on the electron injection were investigated.