Photoinduced Charge Injection From Excited Triplet Hypocrellin B Into Tio2 Colloid In Ethanol

Photosensitization of TiO2 colloid by hypocrellin B (HB), a natural photodynamic pigment with extremely high photostability, has been studied by surface enhanced Raman spectroscopy (SERS), laser flash photolysis and electron paramagnetic resonance (EPR) techniques. The photosensitization of TiO2 occurred practically from the excited triplet dye and the electron injection rate constant is 1.3 x 10(6) s(-1). The influences of donor and acceptor on the electron injection were investigated.