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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.
Benelli et al. (Sun,) studied this question.