Coordination enhancement of single-molecule magnet behavior of Tb(III)–Cu(II) dinuclear systems |
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| Authors: | Takashi Kajiwara Kohei Takahashi Tomonari Hiraizumi Shinya Takaishi Masahiro Yamashita |
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| Institution: | 1. Department of Chemistry, Graduate School of Science, Tohoku University and Crest, JST, 6-3 Aza-aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan;2. Department of Chemistry, Faculty of Science, Tohoku University, 6-3 Aza-aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan |
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| Abstract: | Tb(III)–Cu(II) based single-molecule magnets (SMMs) were synthesized to investigate the relationship between magnetic anisotropy and the symmetry of the ligand field, by the reaction of TbCu(o-vanilate)2(NO3)3] with 2,2-dimethyl-1,3-propanediamine (3), followed by the reaction of one another equivalent of o-vaniline (4). Both complexes behave as SMM in the temperature range of 2.8–4.0 K (3) and 2.8–5.2 K (4), showing semi-circle shapes of Cole–Cole plots with α parameters in the ranges of 0.27–0.41 and 0.11–0.32. The energy barriers Δ/kB for the spin flippings were estimated from the Arrhenius plots to be 29(2) K for 3 and 32.2(6) K for 4, respectively. |
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