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Mono-, di- and trinitroxylradicals are investigated in solution by ESR spectroscopy. The ESR spectra of all multispin systems studied can be interpreted under the assumption of an exchange interaction of the radical electrons. The exchange energies J are evaluated by comparison of experimental and theoretical line positions. The temperature dependence of J leads to activation energies around 1.5 Kcal/Mol. The analysis of proton hfs of the biradicals indicates the existence of two radical species which slow and fast exchange rates.

ESR-Untersuchungen von Nitroxyl-Radikalen / ESR Studies of Nitroxyl Radicals