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The radical anion of dimesityltetraketone (E Red, I  = -0.40 V) is easily generated in THF by potassium mirror/[2.2.2]-cryptand reduction. Its contact ion pairs with Na ⊕ , Cs ⊕  and Ba ⊕⊕  counter cations, prepared in THF solution by single electron transfer from the respective metals, are characterized by their ESR/ENDOR spectra, which exhibit temperature-dependent metal couplings of a Na  ⊕  = 0.061 mT (190 K), a Cs  ⊕  = 0.021 mT (190 K), and a Ba  ⊕⊕  = 0.145 mT (295 K).

zeitschrift für naturforschung b

Elektronentransfer und Ionenpaare, 15 [ 1– 3] Radikalanion und Radikal-Kontakt-Ionenpaare von Dimesityl-tetraketon / Electron Transfer and Ion Pairing, 15 [1-3] Radical Anion and Radical Ion Pairs of Dimesityl Tetraketone