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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Erbium-formate frameworks templated by diammonium cations: Syntheses, structures, structural transition and magnetic properties
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Erbium-formate frameworks templated by diammonium cations: Syntheses, structures, structural transition and magnetic properties

机译：以二铵阳离子为模板的甲酸甲酸酯骨架：合成，结构，结构转变和磁性

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摘要

Two structurally different Er-formate frameworks, one NaCl-like [dmenH _2][Er(HCOO)_4]_2 (1) and the other pillared-layer type [tmenH_2][Er(HCOO)_4]_2 (2), were obtained when templated by the corresponding protonated N,N′- dimethylethylenediamine (dmenH2) and N,N,N′,N′- tetramethyl- ethylenediamine (tmenH_2). The shape and size of the template cations dictate the different coordination geometries of erbium and consequently the framework topologies, though erbium adopts eight coordination in the two compounds. In the NaCl-like structure of 1, erbium is coordinated by eight anti-anti bridging formates in a square antiprism, while in the pillared-layer structure of 2, it is coordinated by six anti-anti bridging formates and one chelating formate in a pentagonal bipyramid. 2 exhibits a structural phase transition around -70°C which is related to the disorder-order transition of the template cation. Both compounds behave as paramagnets between 2 and 300 K. However, they display field-dependent ac-susceptibilities with complicated field-induced magnetic relaxation processes, and the major slow ones probably results from spin-lattice relaxation.
机译：两个结构上不同的Er-甲酸酯骨架，一种是类似NaCl的[dmenH _2] [Er（HCOO）_4] _2（1），另一种是柱状层类型[tmenH_2] [Er（HCOO）_4] _2（2）。当由相应的质子化的N，N'-二甲基乙二胺（dmenH2）和N，N，N'，N'-四甲基-乙二胺（tmenH_2）模板化时获得。模板阳离子的形状和大小决定了coordination的不同配位几何形状，因此决定了骨架的拓扑结构，尽管though在两种化合物中采用了八种配位。在1的NaCl样结构中，由方形反棱镜中的八种抗-反桥构型配位，而在2的柱状层结构中，a中的六种抗-反桥构型和一种螯合甲酸酯配位。五角双锥。图2显示了在-70℃附近的结构相变，其与模板阳离子的无序转变有关。两种化合物在2至300 K之间都具有顺磁体的作用。但是，它们表现出依赖于磁场的ac磁化率，具有复杂的磁场感应的磁弛豫过程，而主要的慢速激磁可能是由于自旋晶格弛豫引起的。

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