Symmetry-Supported Magnetic Blocking at 20 K in Pentagonal Bipyramidal Dy(III) Single-Ion Magnets

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• 作者：Yan-Cong Chen ; Jun-Liang Liu ; Liviu Ungur ; Jiang Liu ; Quan-Wen Li ; Long-Fei Wang ; Zhao-Ping Ni ; Liviu F. Chibotaru ; Xiao-Ming Chen ; Ming-Liang Tong
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：March 2, 2016
• 年：2016
• 卷：138
• 期：8
• 页码：2829-2837
• 全文大小：738K
• ISSN：1520-5126

文摘

Single-molecule magnets (SMMs) that can be trapped in one of the bistable magnetic states separated by an energy barrier are among the most promising candidates for high-density information storage, quantum processing, and spintronics. To date, a considerable series of achievements have been made. However, the presence of fast quantum tunnelling of magnetization (QTM) in most SMMs, especially in single-ion magnets (SIMs), provides a rapid relaxation route and often sets up a limit for the relaxation time. Here, we pursue the pentagonal bipyramidal symmetry to suppress the QTM and present pentagonal bipyramidal Dy(III) SIMs [Dy(Cy₃PO)₂(H₂O)₅]Cl₃·(Cy₃PO)·H₂O·EtOH (1) and [Dy(Cy₃PO)₂(H₂O)₅]Br₃·2(Cy₃PO)·2H₂O·2EtOH (2), (Cy₃PO = tricyclohexyl phosphine oxide). Magnetic characterizations reveal their fascinating SMM properties with high energy barriers as 472(7) K for 1 and 543(2) K for 2, along with a record magnetic hysteresis temperature up to 20 K for 2. These results, combined with the ab initio calculations, offer an illuminating insight into the vast possibility and potential of what the symmetry rules can achieve in molecular magnetism.