Abstract
An unreported nitronyl nitroxide radical ligand and its corresponding radical-4f (complexes 1–3) and radical-3d-4f complexes (complexes 4–6) were successfully prepared. Structural analyses indicate that the complexes 1–3 are cyclic structures consist of two identical units of Ln(hfac)3(NIT-5-OCH3-3pyridine) (hfac = hexafluoroacetylacetone; Ln = Gd 1, Tb 2, Dy 3), while the complexes 4–6 show 1D zigzag structures with periodic [Rad–Ln–Rad–Cu] (Ln = Gd 4, Tb 5, Dy 6) units. Dc susceptibility measurements reveal that two different magnetic interactions coexist in complex 1: (i) ferromagnetic coupling between Gd3+ and radical through the NO group, (ii) weak antiferromagnetic interaction between Gd3+ and radical through the pyridine ring. While for complex 4, weak ferromagnetic coupling between Cu2+/Ln3+ and radical ligands as well as antiferromagnetic coupling between two adjacent radicals via the Ln3+ are observed at the same time. Furthermore, AC magnetic studies reveal that complexes 2, 3 and 5 display slow magnetization relaxation at low-temperature.
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