Details

Autor(en) / Beteiligte

• Meng, Yin‐Shan
• Xiong, Jin
• Yang, Mu‐Wen
• Qiao, Yu‐Sen
• Zhong, Zhi‐Qiang
• Sun, Hao‐Ling
• Han, Jun‐Bo
• Liu, Tao
• Wang, Bing‐Wu
• Gao, Song

Titel

Experimental Determination of Magnetic Anisotropy in Exchange‐Bias Dysprosium Metallocene Single‐Molecule Magnets

Ist Teil von

• Angewandte Chemie (International ed.), 2020-07, Vol.59 (31), p.13037-13043

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We investigate a family of dinuclear dysprosium metallocene single‐molecule magnets (SMMs) bridged by methyl and halogen groups [Cp′2Dy(μ‐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°) due to the stronger equatorial interactions between DyIII 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. The single‐molecule magnets (SMMs) [Cp′2Dy(μ‐X)]2 (Cp′=cyclopentadienyltrimethylsilane anion; X=CH3−, Cl−, Br−, I−) are investigated. For the first time, the magnetic easy axes of dysprosium metallocene SMMs are experimentally determined, confirming that they are oriented perpendicular to the equatorial plane which is made up of dysprosium and bridging atoms.