By: Toshiaki Tsukuda, Takayoshi Suzuki, Sumio Kaizaki *
Department of Chemistry, Graduate School of Science, Faculty of Science, Osaka University, 1-1 Machikaneyamachyo,
Synthesis, characterization and magnetic properties of new lanthanide–radical complexes, [LnIII(hfac)3(IM2imH)] (Ln = Gd, Tb; IM2imH = 2-(2-pyridyl)-4,5-dihydro-4,4,5,5-tetramethyl-1H-imidazolyl-1-oxy), are described. The molecular structure of the [Tb(hfac)3(IM2imH)] has been determined by the X-ray diffraction. The magnetic susceptibility data for [Gd(hfac)3(IM2imH)] show that the Gd–IM2imH magnetic interaction is antiferromagnetic with an exchange coupling constant J = 2.59 cm 1 in contrast to the ferromagnetic interaction in most of Gd(III) complexes containing paramagnetic center, which will be examined in connection with planarity of the IM2imH chelate.
Keywords: Lanthanide complexes; Imino nitroxide radical ligand; Magnetic interaction
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