[Ga_(18)(SitBu_3)_8]and [Ga_(22)(SitBu_3)_8] -Syntheses and Structural Characterization of Novel Gallium Cluster Compounds

Alexander Donchev; Andreas Schnepf; Gregor StoBer; Elke Baum; Hansgeorg Schnockel; Thomas Blank

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[Ga_(18)(SitBu_3)_8]and [Ga_(22)(SitBu_3)_8] -Syntheses and Structural Characterization of Novel Gallium Cluster Compounds

机译：[Ga_（18）（SitBu_3）_8]和[Ga_（22）（SitBu_3）_8]-新型镓簇化合物的合成与结构表征

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摘要

The novel neutral gallium cluster compounds [Ga_(22)R_8] (1) and [Ga_(18)R_8](2) are obtained by warming up a metastable solution of gallium(I) bromide in THR/C_6H_5CH_3 after addition of equimolar amounts of supersilyl so-dium NaR from -78 deg C to room temperature (R=SitBu_3=supersily).From X-ray structure analyses,the ob-served arrangements of the 18 and 22 Ga atoms in 1 and 2,respectively,are comparable with an 18 atom section of the #beta#-Ga modification,or show at least some kind of the Ga-III modification.This allows a description of the Gaatoms in 2 is also well explained by the wade-Mingos rules as an eightfold capped closo-Ga_(14) cluster,whereby the Ga atoms of Ga_(14) occupy the center and the corners of a cuboctahedron with one Ga_3 face replaced by a Ga_4 face.Some concepts are presented about the for-mation mechanism,the cluster growth,and the metalloid character of the two Ga cluster compounds.

机译：加入等摩尔量后，通过加热溴化镓（I）在THR / C_6H_5CH_3中的亚稳溶液，获得新型中性镓簇化合物[Ga_（22）R_8]（1）和[Ga_（18）R_8]（2） -78℃至室温（R = SitBu_3 = supersily）中的超甲硅烷基钠。从X射线结构分析，观察到的1和2中18和22 Ga原子的排列是可比较的带有＃beta＃-Ga修饰的18个原子部分，或显示至少某种Ga-III修饰。这使得对2中的Gaatoms的描述也被wade-Mingos规则很好地解释为八倍上限Closo-Ga_（14）团簇，其中Ga_（14）的Ga原子占据了立方八面体的中心和角，其中一个Ga_3面被Ga_4面取代。提出了一些有关形成机理，簇生长的概念，以及两个Ga簇化合物的准金属特征。

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来源
《Chemistry: A European journal》 |2001年第15期|共7页
作者
Alexander Donchev; Andreas Schnepf; Gregor StoBer; Elke Baum; Hansgeorg Schnockel; Thomas Blank;
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正文语种 eng
中图分类化学;应用化学;
关键词
gallium; cluster com-pounds; silicon; struture elucidation;

机译：镓;簇合物;硅;结构阐明;

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1. [Ga_(18)(SitBu_3)_8]and [Ga_(22)(SitBu_3)_8] -Syntheses and Structural Characterization of Novel Gallium Cluster Compounds [J] . Alexander Donchev, Andreas Schnepf, Gregor StoBer, Chemistry: A European journal . 2001,第15期

机译：[Ga_（18）（SitBu_3）_8]和[Ga_（22）（SitBu_3）_8]-新型镓簇化合物的合成与结构表征
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[Ga_(18)(SitBu_3)_8]and [Ga_(22)(SitBu_3)_8] -Syntheses and Structural Characterization of Novel Gallium Cluster Compounds

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