Electron transfer reactions between the superoxide ion and quinones

✍ Scribed by I. B. Afanas'ev; S. V. Prigoda; T. Ya. Mal'tseva; G. I. Samokhvalov

• Publisher: John Wiley and Sons
• Year: 1974
• Tongue: English
• Weight: 765 KB
• Volume: 6
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550060504

✦ Synopsis

Abstract

The electron transfer reactions of the superoxide ion with benzoquinone, trimethylbenzoquinone, and menadione in dimethylformamide were studied. A procedure of the determination of the relative rate constants of these reactions was developed; the reaction of O~2~ with butyl bromide was chosen as a standard one. The relative rate constants measured at 20,°, 35°, and 50°C were slightly dependent on the quinone structure.

The relationship between the free energy Δ__F__*of the electron transfer reactions and the standard free energy Δ__F__^o^ was discussed. This relationship is proposed as Δ__F__* = αΔ__F__^o^ + β, where the proportionality coefficient α is equal to 0.04–0.11 for exothermal reactions and to 0.90–0.96 for endothermal reactions.