Abstract
Oxidative quenching by pc(II) of the triplet excited states 3 Zn(cyt) and 3 Sn(cyt) is studied by laser flash photolysis. The quenching is biphasic at low ionic strength. The faster component corresponds to the unimolecular electron-transfer reactions within the electrostatic complexes 3 M(cyt) /pc(II), in which M is Zn(II) or Sn(IV); these reactions are the main subject of this study. The slower component corresponds to the bimolecular reactions between the unassociated 3 M(cyt) and pc(II). The relative amplitudes of the two components depend on ionic strength and pc(II) concentration in a predictable way. The unimolecular reaction is studied in solutions whose viscosity is adjusted with glycerol, ethylene glycol, and D-glucose
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