Synthesis, structures, and magnetic properties of a series of new heterometallic hexanuclear Co2Ln4 (Ln = Eu, Gd, Tb and Dy) clusters

被引:35
作者
Tian, Chong-Bin [1 ]
Yuan, Da-Qiang [1 ]
Han, Yun-Hu [1 ,2 ]
Li, Zhi-Hua [1 ]
Lin, Ping [1 ]
Du, Shao-Wu [1 ]
机构
[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou, Fujian, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China
来源
INORGANIC CHEMISTRY FRONTIERS | 2014年 / 1卷 / 09期
基金
中国国家自然科学基金;
关键词
SINGLE-MOLECULE MAGNET; METAL-ORGANIC FRAMEWORK; LANTHANIDE COMPLEXES; SLOW RELAXATION; FERROMAGNETIC INTERACTION; CRYSTAL-STRUCTURES; ENERGY-LEVELS; SCHIFF-BASE; TETRANUCLEAR; EXCHANGE;
D O I
10.1039/c4qi00116h
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A series of new Co-Ln heterometallic clusters formulated as [Co(2)Ln(4)(mu(3)-OH)(2)(piv)(4)(hmmp)(4)(ae)(2)]center dot (NO3)(2)center dot 2H(2)O (Ln = Eu (1), Gd (2), Tb (3), Dy (4), H(2)hmmp = 2-[(2-hydroxyethylimino)methyl]-6-methoxy-phenol, Hae = 2-aminoethanol, Hpiv = pivalic acid) were synthesized and characterized. X-ray crystallography reveals that each of them contains a heterometallic {Ln(4)Co(2)} core, which is supported by two mu(3)-hydroxide, four piv(-), four hmmp(2-) and two ae(-) ligands. The magnetic investigation indicates that 2 exhibits weak antiferromagnetic interactions between Gd-III ions, and a large MCE value of 24.9 J kg(-1) K-1, while 4 shows a fast relaxation of magnetization. The TGA and VT-PXRD measurements suggest that all the compounds show good thermal stability and can be stable up to about 220 degrees C. In addition, to address the influence of the Gd-O-Gd angles on the magnetic properties, compound 2 was compared with a series of compounds involving different bridges between GdIII ions. The comparison reveals that the tiny difference in the Gd-O-Gd angles favors different magnetic coupling.
引用
收藏
页码:695 / 704
页数:10
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