中华医学超声杂志

应用化学 ›› 2017, Vol. 34 ›› Issue (9): 1086-1092.DOI: 10.11944/j.issn.1000-0518.2017.09.170176

• 研究论文 • 上一篇    下一篇

稀土簇基金属有机框架的合成、结构及磁学性质

郑秀英,孔祥建(),龙腊生(),郑兰荪   

  1. 厦门大学化学化工学院,固体表面物理化学国家重点实验室,能源材料化学协同创新中心 福建 厦门 361005
  • 收稿日期:2017-05-25 接受日期:2017-06-28 出版日期:2017-08-31 发布日期:2017-08-31
  • 通讯作者: 孔祥建,龙腊生
  • 基金资助:
    国家自然科学基金(21422106,21371144,21431005)资助项目

Synthesis, Structure, Magnetic Properties of Lanthanide Cluster-Based Metal-Organic Frameworks

ZHENG Xiuying,KONG Xiangjian(),LONG Lasheng(),ZHENG Lansun   

  1. Collaborative Innovation Center of Chemistry for Energy Materials,State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry,College of Chemistry and Chemical Engineering, Xiamen University,Xiamen,Fujian 361005,China
  • Received:2017-05-25 Accepted:2017-06-28 Published:2017-08-31 Online:2017-08-31
  • Contact: KONG Xiangjian,LONG Lasheng
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21422106, No.21371144, No.21431005)

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摘要：

通过溶剂热法合成出了两种稀土簇基金属有机框架材料:{[Ln7(OH)8(HOCH2COO)8(H2O)3]·Cl5·3H2O}n(Ln=Gd(1),Dy(2))。 磁性研究表明,化合物1在低温下具有较大的磁热效应,在3 K、7 T时磁熵变值高达44.4 J/(kg·K),化合物2在不加直流场的情况下具有明显的频率依赖性,表明化合物2具有缓慢弛豫的性质。 此外,粉末衍射结果发现,化合物1和2具有非常高的化学稳定性,其可稳定存在于pH值1~14的水溶液及沸水中。 结果表明,稀土簇基金属有机框架材料在低温磁制冷方面具有潜在的利用价值。

关键词: 稀土金属有机框架, 磁热效应, 频率依赖性, 化学稳定性

Abstract:

Two lanthanide cluster-based metal-organic frameworks of {[Gd7(OH)8(HOCH2COO)8(H2O)3]·Cl5·3H2O}n(Ln=Gd(1), Dy(2)) were obtained by solvothermal reaction. The magnetic studies indicate that compound 1 exhibits a large magnetocalotic effect(MCE) values of 44.4 J/(kg·K) at 2 K and ΔH=7 T and compound 2 displays obvious frequency dependence(Hdc=0) which suggests that compound 2 shows slow relaxation. In addition, the results of powder diffraction reveals that compounds 1 and 2 display very high chemical stability, which can be stable in acid/base solution of pH=1~14 and boiling water. These results indicate that the lanthanide cluster-based metal-organic frameworks have the potential application in the low-temperature refrigeration.

Key words: lanthanide organic-metal frameworks, magnetocalotic effect, frequency dependence, chemical stability

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