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首页> 外文期刊>Crystal growth & design >Self-assembled one-and two-dimensional networks based on NH _2Me_2[ReX_5(DMF)] (X = Cl and Br) species: Polymorphism and supramolecular isomerism in Re(IV) compounds
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Self-assembled one-and two-dimensional networks based on NH _2Me_2[ReX_5(DMF)] (X = Cl and Br) species: Polymorphism and supramolecular isomerism in Re(IV) compounds

机译：基于NH _2Me_2 [ReX_5（DMF）]（X = Cl和Br）物种的自组装一维和二维网络：Re（IV）化合物的多态性和超分子异构

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摘要

Three mononuclear rhenium(IV) compounds of general formula NH _2Me_2[ReX_5(DMF)] [NH_2Me _2~+ = dimethylammonium cation, DMF = N,N-dimethylformamide, and X = Cl (1 and 2) and Br (3)] have been prepared and characterized. In all three cases, the rhenium atom is sixcoordinated by five chloro (1 and 2) or bromo (3) atoms and one oxygen atom from a DMF molecule (1-3) building a somewhat distorted octahedral surrounding. Short Re~(IV)-X · · · X-Re~(IV) contacts and H-bonds occur in the crystal lattice generating novel supramolecular Re(IV) architectures. 1 and 2 are polymorphs and supramolecular isomers that exhibit supramolecular ladder-like (1) and rectangular two-dimensional grids (2), the different intermolecular X · · · X contacts playing a structure-determining role. Noteworthy, the formation of 1 and 2 is selective and dependent on the crystallization conditions. Although compound 3 is isolated using the same crystallization conditions as 2, their crystal packing is different. The investigation of the magnetic behavior of 1-3 in the temperature range 1.9-250 K showed the occurrence of maxima of the magnetic susceptibility at 10.5 (1), 12.0 (2), and 17.0 K (3), which are the signature of significant intermolecular antiferromagnetic interactions. The short Re~(IV)-X · · · X-Re~(IV) contacts provide the exchange pathway for the overall antiferromagnetic behavior observed in 1-3. The magnetostructural results of 1-3 are compared with those of the related compounds NBu_4[ReX _5(DMF)] [NBu_4~+ = tetra-n-butylammonium cation with X = Cl (4) and Br (5)] which were reported elsewhere.
机译：三种通式为NH _2Me_2 [ReX_5（DMF）]的单核rh（IV）化合物[NH_2Me _2〜+ =二甲基铵阳离子，DMF = N，N-二甲基甲酰胺，X = Cl（1和2）和Br（3）]已经准备和表征。在所有这三种情况下，the原子与DMF分子（1-3）中的五个氯原子（1和2）或溴原子（3）和一个氧原子六配位，从而形成了有点扭曲的八面体周围。短的Re（IV）-X·X-Re〜（IV）接触和H键发生在晶格中，从而产生新颖的超分子Re（IV）结构。 1和2是多晶型物和超分子异构体，表现出超分子梯状（1）和矩形二维网格（2），不同的分子间X···X接触起决定结构的作用。值得注意的是，1和2的形成是选择性的，并取决于结晶条件。尽管使用与2相同的结晶条件分离化合物3，但它们的晶体堆积不同。在1.9-250 K温度范围内对1-3磁行为的研究表明，在10.5（1），12.0（2）和17.0 K（3）处出现了最大磁化率，这是磁化率的标志。明显的分子间反铁磁相互作用。较短的Re〜（IV）-X·X-Re〜（IV）触点为1-3中观察到的整体反铁磁行为提供了交换途径。将1-3的磁结构结果与相关化合物NBu_4 [ReX _5（DMF）] [NBu_4〜+ =四正丁基铵阳离子，X = Cl（4）和Br（5）]进行比较。别处。

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