Photosensitized Oxidation of Leuco-uranine. II. Kinetics of an Acridine-sensitized Photoöxidation in the Deaerated Solution

The acridine-sensitized photoöxidation of leuco-uranine in the deareated aqueous solution was studied kinetically. It was established that about 0.24 of the excited acridine molecules goes to the triplet state and then reacts with leuco-uranine. In favorable conditions, the quantum yield is near 0.20, which shows that the genuine reaction rather predominates over the deactivation process of the triplet state. The pH value dependence of the rate was successfully interpreted from the assumption that each of the different molecular species has a different rate constant.