## Abstract The radical anions of heptalene and of 1, 7‐methano‐[12]annulene are generated by metal reduction and characterized by means of their ESR‐spectra. Whereas the neutral hydrocarbons are π‐bond localized their corresponding radical anions turn out to be π‐bond delocalized. This could be de
MCD and absorption spectra of the monovalent anion of tribenzo [12] annulene
✍ Scribed by R.E. Koning; P.J. Zandstra
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 313 KB
- Volume
- 56
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
The magnetic circular dichrcism (MCD) and absorption spectra of the monovalent anion of tribenzo [ 121 annulene have been measured in the visiib and the near-infrared region. Ihe absence of a temperature dependence of the MCD proves a non-degenerate ground state. An as.sigrunent of the spectra has been given with the aid of a scmi-empiricat ~-eIectron caku-&ion (PPP approximation)_ Influence of the counter ion on optical and ESR spectra was tested by the use of different soivents. No divalent anions couId be obtained.
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## 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‐