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ESR and ENDOR investigations of phenanthrenesemiquinones

Stegmann, H. B. ; Dao-Ba, Hoang ; Mäurer, M. ; Buchner, Hans ; Hartmann, Erwin ; Mannschreck, Albrecht


A series of phenanthrenesemiquinone–diphenylthallium complexes were prepared in solution from the corresponding quinones. ESR, ENDOR and TRIPLE spectra provided the proton coupling constants and the unambiguous assignment to distinct molecular positions. The thallium splitting becomes considerably less negative if the semiquinones are twisted by steric hindrance in the 4- and 5-positions. On the ...


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