The peroxyoxalate reaction, one of the most important chemiluminescent systems today, is being widely used as an analytical tool. On the other hand, there are few kinetic studies of this system in aqueous media, obviously due to the occurrence of the parallel reaction of oxalic ester hydrolysis that makes it difficult to study the chemiluminescent reaction. In this work it was possible to perform a kinetic study on the peroxyoxalate reaction in exclusively aqueous media, using borate buffer as a catalyst. The concentration of borate buffer in the reaction of bis(2,4,6-trichlorophenyl) oxalate with hydrogen peroxide in the buffered medium pH = 8.2 was also varied using fluorescein and rhodamine 6G as activators and it was observed that the buffer concentration did not influence the rate constant, even with a 10-fold increase in the borate concentration. In the same way, the quantum yields did not seem to vary significantly with the concentration of the same. A linear dependence of the rate constant with the peroxide anion concentration was observed for two fixed borate concentrations. As the reaction rate was pH-dependent but not altered with different buffer concentrations, it can be concluded that the reaction of TCPO with H<sub>2</sub>O<sub>2</sub> in this buffered aqueous medium occurs by specific basic catalysis.

Kinetic studies of the peroxyoxalate chemiluminescence in borate buffer

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.