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Europium(II1) and gadolinium(II1) hexafluoroacetylacetonates, M(hfac),, form stable bis adducts with nitronyl nitroxides (2--4,4,5,5-tetramethyl-4,5-dihyd1rHo-- imidazolyl-1-oxy13 -oxide, NITR; R = phenyl, ethyl). The magnetic properties of Gd-(hfac),(NITPh), were investigated in the range 1.1-300 K, while all the other compounds were studied in the range 4-300 K. gadolinium(II1) ions were found to be weakly coupled in a ferromagnetic fashion to the radical, while the radicals are coupled to each other. The possible mechanisms responsible for this behavior are discussed.
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Benelli et al. (1989) studied this question.
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