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Unusual Features in the ESR. Spectra of 1, 6-Methano[10] annulene Radical Anion. A modified mcconnell equation for non-planar π-radicals

✍ Scribed by F. Gerson; K. Müllen; E. Vogel

Publisher: John Wiley and Sons
Year: 1971
Tongue: German
Weight: 782 KB
Volume: 54
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19710540834

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✦ Synopsis

Abstract

ESR. spectra of the radical anions of 1, 6‐methano[10]annulene (I) and its 2,5,7,10‐tetradeuterio derivative II are reported for a temperature range of over 100°. The abnormally small magnitudes of the α‐proton coupling constants are attributed to the deviation of the tenmembered π‐perimeter from planarity; an extension of the McConnell equation is proposed to achieve agreement between theory and experiment. It is suggested that the marked temperature‐dependence of the ESR. spectra arises from slight changes in geometry which for I^⊖^ should have a more pronounced effect on the α‐proton coupling constants than for planar π‐radicals.

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✍ Fabian Gerson; Klaus Müllen; Christoph Wydler 📂 Article 📅 1976 🏛 John Wiley and Sons 🌐 German ⚖ 350 KB

## Abstract ESR. and ENDOR. spectra are reported for the radical anion of the 2‐methyl derivative (III) of 1,6‐methano[10]annulene (I). Comparison of the hyperfine data for I·⊖ and III·⊖ with those for the radical anions of naphthalene (II) and its 1‐methyl derivative (IV), respectively, confirms t