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Spatial Separation of Covalent, Ionic, and Metallic Interactions in Mg_(11)Rh_(18)B_8 and Mg_3Rh_5B_3

机译:Mg_(11)Rh_(18)B_8和Mg_3Rh_5B_3中共价,离子和金属相互作用的空间分离

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摘要

The crystal structures of Mg_(11)Rh_(18)B_8 and Mg_3Rh_5B_3 have been investigated by using single-crystal X-ray diffraction. Mg_(11)Rh_(18)B_8: space group P4/mbm; a=17.9949(7), c= 2.9271(1)?; Z=2. Mg_3Rh_5B_3: space group Pmma; a=8.450(2), b= 2.8644(6), c=11.602(2) ?; Z=2. Both crystal structures are characterized by trigonal prismatic coordination of the boron atoms by rhodium atoms. The [BRh_6] trigonal prisms form arrangements with different connectivity patterns. Analysis of the chemical bonding by means of the electron-localizability/ electron-density approach reveals covalent B-Rh interactions in these arrangements and the formation of B-Rh polyanions. The magnesium atoms that are located inside the polyanions interact ionically with their environment, whereas, in the structure parts, which are mainly formed by Mg and Rh atoms, multicenter (metallic) interactions are observed. Diamagnetic behavior and metallic electron transport of the Mg_(11)Rh_(18)B_8 and Mg_3Rh_5B_3 phases are in agreement with the bonding picture and the band structure.
机译:通过使用单晶X射线衍射研究了Mg_(11)Rh_(18)B_8和Mg_3Rh_5B_3的晶体结构。 Mg_(11)Rh_(18)B_8:空间组P4 / mbm; a = 17.9949(7),c = 2.9271(1)? Z = 2。 Mg_3Rh_5B_3:空间组Pmma; a = 8.450(2),b = 2.8644(6),c = 11.602(2)? Z = 2。两种晶体结构的特征均在于铑原子与硼原子的三角棱柱配位。 [BRh_6]三角棱镜形成具有不同连通性图案的布置。通过电子定位/电子密度方法对化学键的分析揭示了在这些排列中的共价B-Rh相互作用以及B-Rh聚阴离子的形成。位于聚阴离子内部的镁原子与其周围环境发生离子相互作用,而在主要由Mg和Rh原子形成的结构部分中,观察到多中心(金属)相互作用。 Mg_(11)Rh_(18)B_8和Mg_3Rh_5B_3相的抗磁行为和金属电子传输与键合图和能带结构一致。

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