ESR and ENDOR investigations of phenanthrenesemiquinones
作者： Hartmut B. Stegmann , Hoang Dao-Ba , Manfred Mäurer , Klaus Scheffler , Hans Buchner
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摘要: A series of phenanthrenesemiquinone–diphenylthallium complexes were prepared in solution from the corresponding quinones. ESR, ENDOR and TRIPLE spectra provided proton coupling constants unambiguous assignment to distinct molecular positions. The thallium splitting becomes considerably less negative if semiquinones are twisted by steric hindrance 4- 5-positions. On other hand, substitution 1- 8-positions renders aTI more negative. These results interpreted terms ion-pair solvation.
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