A N23鈥?/sup> Radical-Bridged Terbium Complex Exhibiting Magnetic Hysteresis at 14 K
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- 作者：Jeffrey D. Rinehart ; Ming Fang ; William J. Evans ; Jeffrey R. Long
- 刊名：Journal of the American Chemical Society
- 出版年：2011
- 出版时间：September 14, 2011
- 年：2011
- 卷：133
- 期：36
- 页码：14236-14239
- 全文大小：803K
- 年卷期：v.133,no.36(September 14, 2011)
- ISSN：1520-5126
文摘
The synthesis and magnetic properties of three new N23鈥?/sup> radical-bridged dilanthanide complexes, {[(Me3Si)2N]2(THF)Ln}2(渭-畏2:畏2-N2)鈭?/sup> (Ln = Tb, Ho, Er), are reported. All three display signatures of single-molecule-magnet behavior, with the terbium congener exhibiting magnetic hysteresis at 14 K and a 100 s blocking temperature of 13.9 K. The results show how synergizing the strong magnetic anisotropy of terbium(III) with the effective exchange-coupling ability of the N23鈥?/sup> radical can create the hardest molecular magnet discovered to date. Through comparisons with non-radical-bridged ac magnetic susceptibility measurements, we show that the magnetic exchange coupling hinders zero-field fast relaxation pathways, forcing thermally activated relaxation behavior over a much broader temperature range.