New polyoxometalate-based mononuclear lanthanide complexes with slow relaxation of magnetization

New polyoxometalate-based mononuclear lanthanide complexes with slow relaxation of magnetization
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新型多金属氧酸盐基单核镧系元素配合物,磁化强度缓慢弛豫

DOI:
10.1016/j.ica.2012.10.001
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发表时间:
2013
影响因子:
2.8
通讯作者:
En-Bo Wang
En-Bo Wang
中科院分区:
化学3区
文献类型:
--
作者:
Wen-Zhe Zhou;Xiao-Jia Feng;Hong-Shan Ke;Yang-Guang Li;Jin-Kui Tang;En-Bo Wang

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一系列新型多金属氧酸盐(POM)基单核镧系元素(III)-双吡啶-N-氧化物配合物,[Ln(bpyno)4][PMo12O40]·2H2O(Ln=Dy(1),Tb(2),Er(3),Ho(4); bpyno=4,4'-二甲基-2,2'-联吡啶-N-N'-二氧化物),通过LnPMo12O40盐(Ln=Dy (1), Tb (2), Er (3), Ho (4))与bpyno配体之间的反应合成。所有化合物均通过元素分析、TG分析、IR、粉末X射线衍射和单晶X射线衍射进行表征。在1-4中,每个单核Ln中心由来自四个bpyno配体的八个O原子配位,表现出近似方形反棱镜配位几何形状。此外,[Ln(bpyno)4]3+ 单元被 α-Keggin 型多氧阴离子很好地分开。磁性测量表明化合物 1 表现出频率依赖性交流磁化率,表明磁化强度缓慢弛豫。
A series of new polyoxometalate(POM)-based mononuclear lanthanide(III)–bi pyridine-N-oxide complexes, [Ln(bpyno)4][PMo12O40]·2H2O (Ln=Dy (1), Tb (2), Er (3), Ho (4); bpyno=4,4′-dimethyl-2,2′-bipyridyl-N-N′-dioxide), have been synthesized by the reactions between LnPMo12O40salts (Ln=Dy (1), Tb (2), Er (3), Ho (4)) and bpyno ligand. All compounds were characterized by elemental analyses, TG analyses, IR, powder X-ray diffraction and single-crystal X-ray diffraction. In 1–4, each mononuclear Ln center is coordinated by eight O atoms derived from four bpyno ligands, exhibiting an approximate square antiprismatic coordination geometry. Furthermore, the [Ln(bpyno)4]3+units are well separated by the α-Keggin-type polyoxoanions. Magnetic measurements indicate that compound 1 exhibits frequency dependent ac magnetic susceptibilities indicative of slow relaxation of the magnetization.
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