A Dysprosium Metallocene Single-Molecule Magnet Functioning at the Axial Limit

作者：Guo, Fu-Sheng; Day, Benjamin M.; Chen, Yan-Cong; Tong, Ming-Liang; Mansikkamaki, Akseli; Layfield, Richard A.^*

来源：Angewandte Chemie - International Edition, 2017, 56(38): 11445-11449.

DOI：10.1002/anie.201705426

• anisotropy
• cyclopentadienyl ligands
• dysprosium
• organometallic compounds
• single-molecule magnets

The Abstraction of a chloride ligand from the dysprosium metallocene [(Cp-ttt)(2)DyCl] (1(Dy) Cp-ttt = 1,2,4-tri(tert-butyl)cyclopentadienide) by the triethylsilylium cation produces the first base-free rare-earth metallocenium cation [(Cp-ttt)(2)Dy](+) (2(Dy)) as a salt of the non-coordinating [B-(C6F5)(4)](-) anion. Magnetic measurements reveal that [2(Dy)][B-(C6F5)(4)] is an SMM with a record anisotropy barrier up to 1277 cm(-1) (1837 K) in zero field and a record magnetic blocking temperature of 60 K, including hysteresis with coercivity. The exceptional magnetic axiality of 2(Dy) is further highlighted by computational studies, which reveal this system to be the first lanthanide SMM in which all low-lying Kramers doublets correspond to a well-defined M-J value, with no significant mixing even in the higher doublets.

• 出版日期2017-9-11
• 单位中山大学