ESR spectra of 4.4'-dimethoxyazobenzene radical anion, obtained using sodium or lithium metal reduction in tetrahydrofuran. are presented. The spectra reveal 'contact' ion-pairs in the sodium case and 'free' anions in thelithium case. -
The radical anion of (E)-azobenzene revisited
โ Scribed by Urs Buser; Caspar H. Ess; Fabian Gerson
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 343 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0749-1581
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โฆ Synopsis
Abstract
The radical anion of (E)โazobenzene, generated from the neutral compound by reaction with potassium mirror in an ethereal solvent, has been fully characterized by its hyperfine data with the use of ESR, ENDOR and TRIPLEโresonance spectroscopy. Assignments of coupling constants to protons in the individual positions are based on comparison with the spectra of the radical anions of 4,4โฒโdideuterio and 2,2โฒโdimethyl derivatives. Effects of ^14^N hyperfine anisotropy on ESR spectra and of association with the counter ion K^+^ are briefly discussed.
๐ SIMILAR VOLUMES
## Abstract ESR. and ENDOR. studies are reported for the radical anions of 1,2โdiphenylcyclopentene (**3**) and its di(pe+deuteriophenyl)โderivative (3โD~10~). Comparison of the coupling constants of the phenyl protons in **3**\documentclass{article}\pagestyle{empty}\begin{document}$ ^{\ominus \ato