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Abstract
Two Ln-Ni heterometallic complexes connected with nitronyl nitroxides [Ln(hfac)3Ni(hfac)2NIT-4py(H2O)2] (Ln = Gd (1), Tb (2); hfac = hexafluoroacetylacetonate; NIT-4py = 2-(4-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) have been synthesized as well as characterized. For two complexes, the NIT-4py radical is ligated to the Ln(III) ion and Ni(II) ion via its NO moiety and pyridine-N atom, respectively, resulting in rare radical bridged Ln-Ni heterobinuclear structure. Magnetic studies reveal that the magnetic exchanges arising from the uncoordinated NO groups dominate the system. Interestingly, the Tb compound displays a slow relaxation of magnetization.
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