Evidence for a higher oxidation state of manganese in the reaction of dinuclear manganese complexes with oxidants. Comparison with iron based Gif chemistry
✍ Scribed by Derek H.R. Barton; Seung-Yong Choi; Bin Hu; Jason A. Smith
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- French
- Weight
- 664 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0040-4020
No coin nor oath required. For personal study only.
✦ Synopsis
Binuclear manganese complexes mimic the catalase enzyme by converting hydrogen peroxide rapidly and efficiently to oxygen and water. The complex (1) may be activated by either periodic acid or Oxone ® and can oxidize selected organic substrates. Potassium manganate gave similar oxidation products suggesting that the manganese is transformed to a higher oxidation state. Kinetic studies with the Mn iiV IV.Mn I complex show an induction period indicatinl~ that it is not the active catalyst. Further studies suggested that the actual catalytic species is a Mnlll-Mn IV complex. These complexes show similar properties to the activation of FeCI3 with hydrogen peroxide. This is particularly evident by the formation of a new and unusual peroxide from ergosterol acetate.