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2020 , Vol. 78 >Issue 5: 412 - 418

DOI: https://doi.org/10.6023/A20030077

研究论文

轴向卤离子配位调控金属冠醚铽(III)配合物的慢磁弛豫行为

  • 万瑞辰 ,
  • 伍思国 ,
  • 刘俊良 ,
  • 贾建华 ,
  • 黄国璋 ,
  • 李泉文 ,
  • 童明良
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  • 中山大学化学学院 生物无机与合成化学教育部重点实验室 广州 510275

收稿日期: 2020-03-19

  网络出版日期: 2020-04-21

基金资助

项目受国家自然科学基金（Nos.21771198，21620102002）、广东省自然科学基金（No.2017A030313059）、广州市科技计划项目珠江科技新星专题（No.201806010192）和高校基本科研业务费（No.19lgyjs31）资助.

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Modulation of Slow Magnetic Relaxation for Tb(III)-Metallacrown Complexes by Controlling Axial Halide Coordination

  • Wan Rui-Chen ,
  • Wu Si-Guo ,
  • Liu Jun-Liang ,
  • Jia Jian-Hua ,
  • Huang Guo-Zhang ,
  • Li Quan-Wen ,
  • Tong Ming-Liang
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  • Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275

Received date: 2020-03-19

  Online published: 2020-04-21

Supported by

Project supported by the National Natural Science Foundation of China (Nos. 21771198, 21620102002), the Natural Science Foundation of Guangdong Province (No. 2017A030313059), the Science and Technology Plan of Guangzhou (No. 201806010192) and the Fundamental Research Funds for Central Universities (No. 19lgyjs31)

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摘要

以金属冠醚[15-MCNi（II）-5]和卤素离子分别作为Tb（III）在赤道平面和轴向上的配体，成功地组装了三例混合过渡金属-稀土配合物{TbNi5X2}（X=F，Cl，Br），其中TbNi5F2为首例双氟端基配位的稀土配合物.X射线单晶衍射分析结果表明，配合物中Tb（III）离子采用具有高轴次对称性的五角双锥（D5h）配位方式，表明利用金属冠醚策略可以定向构筑含五角双锥稀土基元的混合过渡金属-稀土配合物.交流磁化率的测试结果表明，Tb（III）轴向的电荷分布对配合物的慢磁弛豫行为有着重要的影响.依次削弱轴向配体X-的电负性，在1 kOe外场下{TbNi5F2}和{TbNi5Cl2}分别表现出场诱导的单分子磁体和弱的慢磁弛豫行为，而{TbNi5Br2}则由于快速的磁量子隧穿而不表现出慢的磁弛豫行为.

关键词： 稀土; 铽离子; 金属冠醚; 慢磁弛豫; 单分子磁体

本文引用格式

万瑞辰 , 伍思国 , 刘俊良 , 贾建华 , 黄国璋 , 李泉文 , 童明良 . 轴向卤离子配位调控金属冠醚铽(III)配合物的慢磁弛豫行为[J]. 化学学报, 2020 , 78(5) : 412 -418 . DOI: 10.6023/A20030077

Abstract

Single-molecule magnets (SMMs), exhibiting magnetic bistability and slow magnetization relaxation, have fascinated scientific community for their promising applications in data storage and information processing. Great development has been achieved in lanthanide-based SMMs due to the unquenched orbital momentum and strong anisotropy of lanthanide ions. According to the crystal-field theory, the magnetic anisotropy of lanthanide ions arises from crystal-field splitting. Appropriate arrangement of coordination environment of lanthanide ion (including the local symmetry as well as the charge distribution) is key to design high-performance SMMs. However, it still remains a huge challenge to generate lanthanide-containing compounds with certain coordination environment. Taking advantage of metallacrown (MC) approach, herein a series of 3d-4f complexes {TbNi5X2} (X=F, Cl, Br) were successfully isolated via solvothermal reactions. To obtain these complexes, a mixture of stoichiometric metal salt and quinaldichdroxamic acid with excess of pyridine derivative was dissolved in methanol and then heated at 75℃ for 2 d. X-ray single-crystal diffraction analysis indicated that the Tb(III) site equatorially coordinates with[15-MCNi(II)-5], whilst is axially capped by halide ions. As a result, the lanthanide ion possesses high axiality with a pentagonal bipyramid geometry (D5h). Alternative current magnetic susceptibility data revealed that the electrostatic interactions between f-electrons and ligand electrons play an important role in modulating the magnetic relaxation dynamics. Maximizing the axial charge density in {TbNi5F2} where the[F-Ln-F]+ moiety is firstly reported in lanthanide chemistry, the oblate Tb(III) is placed in a judicious crystal field. The out-of-phase signal of {TbNi5F2} shows obvious temperature and frequency dependence under 1 kOe applied dc field. Additionally, the slow magnetization relaxation of {TbNi5F2} can be fitted by the power law or Arrhenius plot with reversal barrier of 19.0 K. By lowering the electrostatic interactions of axial ligation, the out-of-phase signal significantly weakens in {TbNi5Cl2} and even vanishes in {TbNi5Br2}. The decline of magnetic anisotropy in {TbNi5Cl2} and {TbNi5Br2} accelerates the fast quantum tunneling of magnetization. The results demonstrate for the first time that the Off/Part/On slow magnetization relaxation can be modulated via the improvement of electronegativity of axial ligands.

Key words： lanthanide; Tb (III) ion; metallacrown; slow magnetic relaxation; single-molecule magnets

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