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基于对已报道Gd-Cu配合物的文献调研,发现一类{Ln Cu3}簇合物(Ln=Gd(1),Tb(2),Dy(3)),其Cu II离子被Gd III离子有效分隔且分子内部仅拥有铁磁相互作用,因而对其进行了低温磁制冷性能研究。在已报道实验方法上加以改进,用一锅法制备出一系列异金属{Ln Cu3}簇合物(Ln=Gd(1),Tb(2),Dy(3)),并运用元素分析、红外、单晶/粉末X-射线衍射等方法对其进行表征,以证明其同构性及相纯度。低温磁热效应的研究结果表明簇合物1-3在ΔH=0~7 T下的最大磁熵变值(-ΔSm)分别为16.1(2 K),6.9(5K)和8.1(5 K)J·kg-1·K-1。簇合物1与已报道的Gd-Cu簇合物的磁熵变对比再次证明了弱铁磁相互作用在3d-4f分子磁制冷剂设计中起到重要的作用。
Based on a literature review of reported Gd-Cu complexes, a class of {Ln Cu3} clusters (Ln = Gd (1), Tb (2), Dy (3) Effectively separated and the interior of the molecule has only the ferromagnetic interaction, so its low temperature magnetic refrigeration performance. A series of (Ln = Gd (1), Tb (2), Dy (3)) clusters have been prepared by one-pot method using elemental analysis, IR, single crystal / powder X-ray diffraction and other methods to characterize it to prove its isomorphism and phase purity. The results of the magnetocaloric effect at low temperature show that the maximum magnetic entropy change (-ΔSm) of clusters 1-3 at 16 h (0 K), 6.9 (5 K) and 8.1 (5 K) J at ΔH = · Kg-1 · K-1. The comparison between the magnetic entropy change of cluster 1 and the reported Gd-Cu cluster again proves that the weak ferromagnetic interaction plays an important role in the design of 3d-4f molecular magnetic refrigerant.