Excited state redox chemistry of polypyridyl chromium(III) complexes. A determination of the chromium(III)–(II) self-exchange rate [1]
✍ Scribed by Guillermo J. Ferraudi; John F. Endicott
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 514 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0020-1693
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✦ Synopsis
Ultraviolet excitations of polypyridyl chromium-(III) complexes in alcoholic or aqueous alkaline media have been found to result in formation of chromium(B) complexes apparently in competition with formation of the thermally equilibrated 'E chromium(III) excited state. The upper state process probably involves oxidation of solvent species and can be used as a device for generating very reactive chromium(II) polypyridyl complexes. By selective excitation of one polypyridyl complex in the presence of a second, the i3(PP)p2' self-exchange rate has been investigated and found to be approximately diffusion controlled. This is consistent with the selfexchange rate inferred from the very rapid reactions of other metal complexes with chromium polypyridyl species.