โ Scribed by Mordechai L. Kremer
No coin nor oath required. For personal study only.
The promotion of the Fenton reaction by Cu^2+^ ions has been investigated using a wide range of [Cu^2+^]. Both the disappearance of Fe^2+^ and the evolution of O~2~ were followed as a function of time by quenching the reaction mixture with oโphenanthroline or with excess Fe^2 +^ ions, respectively. Two series of experiments were performed. In one series [H~2~O~2~] was 5 ร 10^โ4^ mol dm^โ3^, and in the other [H~2~O~2~] was reduced to 5 ร 10^โ5^ mol dm ^โ3^. By stopping the reaction with excess Fe^2+^ ions, significant differences in the measured absorbance in the two series were observed. In the higher [H~2~O~2~] range, the absorbance decreased monotonically in time, due to O~2~ formation during the reaction. In the lower range, an initial transient rise of the absorbance was observed, indicating the formation of spectroscopically distinct intermediates in the system. A mechanism involving the intermediates FeOCu^4+^ and FeOCu^5+^ has been set up. Rate constants of the mechanism have been determined. ยฉ 2006 Wiley Periodicals, Inc. Int J Chem Kinet 38: 725โ736, 2006
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