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The electron transfer from singlet states of hypocrellin A (HA) to colloidal TiO 2 nanometer-sized particles has been examined by absorption, fluorescence quenching, fluorescence lifetime measurements, laser flash photolysis and pulse radiolysis techniques. Adsorption of HA onto the surface of TiO 2 particles extended its absorption spectrum further into the visible region, and the...
UV-visible spectroscopy, fluorescence quenching measurements, and single-photon counting have been employed to study electron transfer from excited Hypocrellin A (HA) into the conduction band of a colloidal CdS semiconductor. It has been determined that HA dye adsorbed on colloidal CdS with an apparent association constant of 940 (mol/l) -1 , and fluorescence lifetime measurements gave...
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