应用化学 ›› 2022, Vol. 39 ›› Issue (10): 1586-1592.DOI: 10.19894/j.issn.1000-0518.220008

• 研究论文 • 上一篇    下一篇

空气稳定的高性能大环镝单离子磁体

李慧1,2, 朱振华1, 赵琛1,2, 唐金魁1,2()   

  1. 1.中国科学院长春应用化学研究所,稀土资源利用国家重点实验室,长春 130022
    2.中国科学技术大学,合肥 230026) 3. (中国科学院大学,北京 100049
  • 收稿日期:2022-01-10 接受日期:2022-03-19 出版日期:2022-10-01 发布日期:2022-10-05
  • 通讯作者: 唐金魁
  • 基金资助:
    中国科学院前沿科学重点研究计划(ZDBS-LY-SLH023);中国科学院重点研究计划(ZDRW-CN-2021-3-3);国家自然科学基金(21871247);英国皇家学会牛顿高级学者基金(NA160075)

Air‑stable High Performance Macrocyclic Dysprosium(Ⅲ) Single‑Ion Magnet

Hui LI1,2, Zhen-Hua ZHU1, Chen ZHAO1,2, Jin-Kui TANG1,2()   

  1. 1.State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
    2.University of Science and Technology of China,Hefei 230026,China
    3.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2022-01-10 Accepted:2022-03-19 Published:2022-10-01 Online:2022-10-05
  • Contact: Jin-Kui TANG
  • About author:tang@ciac.ac.cn
  • Supported by:
    the Key Research Program of Frontier Sciences, CAS(ZDBS?LY?SLH023);the Key Research Program of the Chinese Academy of Sciences(ZDRW?CN?2021?3?3);the National Natural Science Foundation of China(21871247);the Royal Society?Newton Advanced Fellowship(NA160075)

摘要:

设计、合成空气稳定的高性能单分子磁体对实现单分子磁体在高密度信息存储、量子计算和分子自旋器件等方面的应用具有非常重要的意义。本文以镝离子为模板,通过NN'-二(2-氨乙基)-1,3-丙二胺与2,6-二乙酰基吡啶原位缩合构筑了一个空气稳定的五角双锥构型的大环镝单离子磁体。单晶X射线衍射表明,镝离子处于赤道大环内部,其轴向位置被2个三苯基硅醇氧负离子占据,抗衡离子为四苯基硼负离子。静态磁性测试表明室温时该化合物的χMT值为13.96 cm3·K/mol,接近单个自由镝离子的理论χMT值14.17 cm3·K/mol,动态磁性测试表明,该化合物在零场下具有典型的单分子磁体行为,各向异性能垒高达1008 K。磁构关系研究表明,其优异的单分子磁体性能主要源于镝离子D5h的局部对称性和三苯基硅醇氧负离子提供的强轴向型晶体场。另外,该化合物在空气中十分稳定,热重分析结果表明,其热分解温度高达297 ℃,为实现单分子磁体在导电基质表面的沉积打下基础。

关键词: 单离子磁体, 镝离子, 晶体场, 有效能垒

Abstract:

Designing and preparing air-stable high-performance single-molecule magnets (SMMs) is of great significance toward the implementation of SMMs in high-density information storage, quantum computation and molecular-based spintronics devices. Herein, an air-stable macrocyclic Dy(III) single-ion magnet with pentagonal bipyramidal local symmetry is obtained by the reaction between NN'-bis(2-aminoethyl)-1,3-propanediamine and 2,6-diacetylpyridine with the dysprosium ion as template. Single crystal X-ray diffraction reveals that the dysprosium ion is encapsulated in the equatorial plane with BPh4- as counter anion and the axial position is occupied by two Ph3SiO-. The state magnetic measurements gives the χMT value of 13.96 cm3·K/mol at room temperature, close to the theoretical value of 14.17 cm3·K/mol for one isolated Dy(III) ion. The dynamic magnetic measurements confirm its typical SMM behavior under a zero dc field with the effective magnetic reversal barrier up to 1008 K. Magneto-structural investigations show that the excellent SMM properties are attributed to the D5h local symmetry and the strongly axial crystal field created by two Ph3SiO- for the dysprosium ion. Thermogravimetric analysis indicates that the compound is extremely air stable and the decomposition temperature reaches up to 297 ℃, which provides a promising avenue for depositing high performance SMMs on conductive substrate surfaces.

Key words: Single-ion magnet, Dysprosium ion, Crystal field, Anisotropy barrier

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