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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >Metal arrays in structural units based on anion-centered metal tetrahedra [Review]
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Metal arrays in structural units based on anion-centered metal tetrahedra [Review]

机译：基于阴离子中心金属四面体的结构单元中的金属阵列[综述]

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Structural units based on anion-centered metal tetrahedra (XA(4); X = O, N; A = metal) are described as eutactic metal fragments with anions in tetrahedral interstices. In this respect these units may be subdivided into fluorite derivatives and units based on stellae quadrangulae (tetrahedral stars). To describe the geometry of the metal arrays a set of tetrahedrally packed metal radii, r(tp), is derived for A = Cu, Pb, Bi, and some rare-earth metals from the systematic analysis of the A...A distances within (XA(4)) tetrahedra. Analysis of these radii and of the structural geometry of the units shows that the insertion of anions into tetrahedral interstices of the metal fragment causes its expansion and distortions by nonbonded anion-anion repulsions. The main effect is owing to the linkage of (XA(4)) tetrahedra via edges, which leads to compression of the shared A...A edges and stretching of the unshared edges. The geometry of this effect is described by some empirical expressions. It is suggested that the eutactic arrangement of metal atoms in structural units based on anion-centered metal tetrahedra is caused by the closed-shell metal-metal bonding interactions. [References: 132]
机译：基于阴离子中心的金属四面体（XA（4）; X = O，N; A =金属）的结构单元被描述为四面体间隙中带有阴离子的共聚金属片段。在这方面，这些单元可以细分为萤石衍生物和基于四方形星（四面体星）的单元。为了描述金属阵列的几何形状，通过对A ... A距离的系统分析得出了A = Cu，Pb，Bi和一些稀土金属的一组四面堆积金属半径r（tp）。 （XA（4））四面体中。对这些半径和单元的结构几何形状的分析表明，将阴离子插入金属碎片的四面体空隙中会导致阴离子由于非键合阴离子-阴离子排斥而膨胀和变形。主要效果是由于（XA（4））四面体通过边的链接，这导致共享A ... A边的压缩和未共享边的拉伸。这种效果的几何形状由一些经验表达式来描述。建议基于原子中心金属四面体的结构单元中金属原子的共聚排列是由闭壳金属与金属的键合相互作用引起的。 [参考：132]

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