期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 31, 页码 13037-13043出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202004537
关键词
angular-resolved magnetometry; dysprosium metallocene; Magnetic anisotropy; single-molecule magnets
资金
- National Natural Science Foundation of China [21801037, 21621061, 21290171, 21971006, 91422302]
- National Key R&D Program of China [2017YFA0206301, 2017YFA0204903]
- Fundamental Research Funds for the Central Universities, China
We investigate a family of dinuclear dysprosium metallocene single-molecule magnets (SMMs) bridged by methyl and halogen groups [Cp ' Dy-2(mu-X)](2) (Cp '=cyclopentadienyltrimethylsilane anion; 1: X=CH3-; 2: X=Cl-; 3: X=Br-; 4: X=I-). For the first time, the magnetic easy axes of dysprosium metallocene SMMs are experimentally determined, confirming that the orientation of them are perpendicular to the equatorial plane which is made up of dysprosium and bridging atoms. The orientation of the magnetic easy axis for 1 deviates from the normal direction (by 10.3 degrees) due to the stronger equatorial interactions between Dy-III and methyl groups. Moreover, its magnetic axes show a temperature-dependent shifting, which is caused by the competition between exchange interactions and Zeeman interactions. Studies of fluorescence and specific heat as well as ab initio calculations reveal the significant influences of the bridging ligands on their low-lying exchange-based energy levels and, consequently, low-temperature magnetic properties.
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