The Electrochemical Oxidation of [CoII(salen)] in Solvent Mixtures—An Example of a Ladder Scheme with Coupled Electron-Transfer and Solvent-Exchange Reactions
✍ Scribed by Dipl.-Chem. Emerich Eichhorn; Prof. Dr. Anton Rieker; Priv.-Doz Dr. Bernd Speiser
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 336 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0044-8249
No coin nor oath required. For personal study only.
✦ Synopsis
Recently Evans discussed electrode processes ['] in which electron-transfer (E) and chemical (C) reactions are coupled in such a way that a horizontal and vertical formulation of the E and C steps, respectively, leads to a closed, cyclic, so-called square scheme. Fence (more than two oxidation states, two structurally different compounds per oxidation state) and ladder schemes (more than two compounds linked by structural changes, in each case two oxidation states) are extensions of the square scheme. Evans emphasizes that ladder schemes are less common than fence schemes.['] He quotes a series of in which the different charge transfers of the ladder scheme could not be detected separately by experiment. We now provide an example of a three-rung ladder scheme that we have discovered during a cyclic voltammetric study of N,N'-bis(2-hydroxybenzylidene)ethylenediaminatocobalt(I1) ([Co(salen)], 1) in several solvents and solvent mixtures. All electron-transfer reactions can be observed.