作者
Fu‐Sheng Guo, Benjamin M Day, Yan‐Cong Chen, Ming‐Liang Tong, Akseli Mansikkamäki, Richard A Layfield
发表日期
2017/9/11
期刊
Angewandte Chemie International Edition
卷号
56
期号
38
页码范围
11445-11449
简介
Abstraction of a chloride ligand from the dysprosium metallocene [(Cpttt)2DyCl] (1Dy Cpttt=1,2,4‐tri(tert‐butyl)cyclopentadienide) by the triethylsilylium cation produces the first base‐free rare‐earth metallocenium cation [(Cpttt)2Dy]+ (2Dy) as a salt of the non‐coordinating [B(C6F5)4]− anion. Magnetic measurements reveal that [2Dy][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 2Dy 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 MJ value, with no significant mixing even in the higher doublets.
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FS Guo, BM Day, YC Chen, ML Tong, A Mansikkamäki… - Angewandte Chemie International Edition, 2017