Sr14Sn3As12 and Eu14Sn3As12: enantiomorph-like Zintl compounds.
Sr14Sn3As12 and Eu14Sn3As12: enantiomorph-like Zintl compounds.
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DOI：
10.1021/acs.inorgchem.5b01145
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发表时间：
2015-09
影响因子：
4.6
通讯作者：
Xiao-Cun Liu;Mingyan Pan;S. Xia;X. Tao
中科院分区：
文献类型：
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作者：
Xiao-Cun Liu;Mingyan Pan;S. Xia;X. Tao
采用锡助熔剂法合成了两种新的手性Zintl化合物Sr 14 Sn 3As 12和Eu 14 Sn 3As 12，并通过X射线单晶衍射对其结构进行了表征。这两种化合物都在三角空间群R3（No. 146，Z = 3）中结晶，阴离子结构包含各种单元：哑铃形[Sn 2As 6]（12-）二聚体，[SnAs 3]（7-）三角锥体和孤立的As（3-）阴离子。非常有趣的是，这两种化合物在观察到的晶体结构中表现出相反的手性，类似于对映体。详细的结构分析表明，可能的空间位阻效应的阴离子团簇，并在计算的电子结构的基础上，大量的电子孤对存在于这两种化合物的阴离子，这可能提供一个线索，以了解在这些金属间化合物的手性的起源。
Two new chiral Zintl compounds, Sr14Sn3As12 and Eu14Sn3As12, were synthesized from tin-flux reactions, and the structures were determined by using single-crystal X-ray diffraction. Both compounds crystallize in the trigonal space group R3 (No. 146, Z = 3) with the anion structures containing various units: dumbbell-shaped [Sn2As6](12-) dimers, [SnAs3](7-) triangular pyramids, and isolated As(3-) anions. Very interestingly, these two compounds exhibit opposite chirality in the observed crystal structures, resembling enantiomorphs. Detailed structure analyses suggest possible steric effects among the anion clusters, and on the basis of the calculated electronic structures, substantial electron lone pairs exist on the anions of both compounds, which may provide a hint to understanding the origination of chirality in these intermetallic compounds.