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J Am Chem Soc. 2011 Sep 14;133(36):14236-9. doi: 10.1021/ja206286h. Epub 2011 Aug 19.

A N2(3-) radical-bridged terbium complex exhibiting magnetic hysteresis at 14 K.

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Department of Chemistry, University of California, Berkeley, California 94720, USA.


The synthesis and magnetic properties of three new N(2)(3-) radical-bridged dilanthanide complexes, {[(Me(3)Si)(2)N](2)(THF)Ln}(2)(μ-η(2):η(2)-N(2))(-) (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 N(2)(3-) 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.

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