Abstract
The crystals of p-(1-oxyl-3-oxido-4,4,5,5-tetramethyl-2-imidazolin-2-yl)benzoic acid and its alkali metal (Li, Na, and K) salts were prepared. Dimer structures were found in the crystals of the free acid 1 and the lithium salt 1·Li· 1 2 MeOH by X-ray crystal structure studies. A dimer model was fitted to the observed magnetic susceptibility data of 1 and 1·Li· 1 2 MeOH in the whole temperature range studied. The optimized exchange coupling parameters 2 J/ k B in the dimers were −6.0 and +31.8 K in 1 and 1·Li· 1 2 MeOH, respectively. The sodium and potassium salts were paramagnetic and analyzed in terms of the Curie-Weiss relation to have weak Weiss fields of θ = −0.4 and −1.0 K, respectively.
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