Elektronentransfer und Ionenpaar-Bildung. 46. Mitteilung. Titrationen von Tetracyanethen mit Alkali- und Erdalkalimetallen in aprotischen Lösungen
✍ Scribed by Hans Bock; Markus Kleine
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- German
- Weight
- 815 KB
- Volume
- 80
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Electron Transfer and Ion-Pair Formation: Titrations of Tetracyanoethene by Alkaline and Alkaline Earth Metals 4 in Aprotic Solution For alkaline and earth alkaline metal 'titrations' of the n-acceptor tetracyanoethene in aprotic (c(HQ) < 0.1 ppm) solution, UVjVIS and ESR spectra have been measured in a sealed glas apparatus. Isosbestic points prove uniform but differing metal-mirror reduction processes for [Li],, ma],, and [K], vs. [Cs],. The formation of solvent-shared or solvent-separated contact ion pairs detected is supported by subsequent crystallization and structure determination. For the tetracyanoethene radical anion, semiempirical PM 3 calculations with limited configuration interaction allow to reproduce the structural data as well as the long-wavelength chargetransfer excitation.