Strontium dimagnesium iron octahydride, SrMg2FeH8, containing octahedral [FeH6]4- complex anions
Strontium dimagnesium iron octahydride, SrMg2FeH8, containing octahedral [FeH6]4- complex anions
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八氢化锶二镁铁，SrMg2FeH8，含有八面体 [FeH6]4- 络合物阴离子
DOI：
10.1016/0925-8388(92)90536-i
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发表时间：
1992
影响因子：
6.2
通讯作者：
P. Fischer
中科院分区：
文献类型：
--
作者：
Baoquan Huang;K. Yvon;P. Fischer
以碱土合金粉末为原料，在490~510°C，130~140bar氢(氢)氢压力下，合成了名义组成为SrMg2.2的碱土合金粉末，并用X射线和中子粉末衍射法对其进行了表征。化合物具有新的三角结构类型，空间群P3m1，晶胞参数a=4.5174(2)Å和c=6.5807(4)Å(氢化物)，a=4.5072(2)Å和c=6.5663(4)Å(氢化物)。该结构包含两种氢原子，一种以八面体构型围绕铁原子，键距[Fe-d1]=1.578(4)Å，另一种位于一个镁原子和三个锶原子形成的四面体空穴中，键距[mg-D2]=1.919(7)Å，[sr-D2]=2.662(1)Å。极限离子式SRD2-Mg2+[Fe6]4-表明该过渡金属络合物符合18电子规则。
SrMg 2 FeH 8 and its deuteride were synthesized by reacting alkaline earth alloy powders of nominal composition SrMg 2.2 with iron powder at 490–510° C and 130–140 bar hydrogen (deuterium) pressure, and characterized by X-ray and neutron powder diffraction. The compounds crystallize with a new trigonal structure type, space group P3m1, and lattice parameters a= 4.5174 (2) A ̊ and c= 6.5807 (4) A ̊ (hydride), a= 4.5072 (2) A ̊ and c= 6.5663 (4) A ̊ (deuteride). The structure contains two types of deuterium atoms, one surrounding iron in an octahedral configuration with bond distances [Fe-D1]= 1.578 (4) A ̊, and the other situated in a tetrahedral hole formed by one magnesium and three strontium atoms with bond distances [Mg-D2]= 1.919 (7) A ̊,[Sr-D2]= 2.662 (1) A ̊. The limiting ionic formula SrD 2-Mg 2 2+[FeD 6] 4-suggests that the transition metal complex conforms to the 18-electron rule.