A FURTHER STUDY ON THE DEGRADATION MECHANISM OF RHODAMINE 6G IN THE PEROXYOXALATE CHEMILUMINESCENT REACTION

In previous work, we have demonstrated that the degradation of rhodamine 6G (R6G) in the peroxyoxalate chemiluminescent reaction may be related to the formation of an intermediate and that the oxidation effect of H2O2 is insignificant. In this paper, the effect of 9,10-diphenylanthracene (DPA) on the degradation of R6G has been examined. The experimental results show that, as the concentration of DPA is increased, the degradation rate of R6G decreases. This can be interpreted in terms of the competitive interaction of DPA and R6G molecules with the intermediate. It was also found that N-2 bubbling of the reaction mixture leads to a decrease in the degradation rate of R6G. On the basis of these experimental results, a mechanism for R6G degradation in the peroxyoxalate chemiluminescent system, involving a reaction intermediate and dissolved oxygen, is suggested.