Destruction of noncentrosymmetry through chalcogenide salt inclusion

被引:23
作者
Choudhury, Amitava [1 ]
Dorhout, Peter K. [1 ]
机构
[1] Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA
关键词
D O I
10.1021/ic060294a
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A salt-inclusion samarium selenogermanate compound, NaSmGeSe4 center dot 0.25Na(2)Se was isolated from a reaction of Na2Se, Sm, GeSe2, and Se. The new structure consists of isolated GeSe4 units and bicapped trigonal-prismatic SmSe8, which are linked together to form corrugated anionic layers. The topology of the layer is similar to the well-known layered compounds ALnQE(4) (A = K, Rb, Cs; Ln = lanthanide ions; Q = Si, Ge; E = S, Se) with some subtle differences. A selenide anion and Na cations in the interlayer space form interesting structures where Se-centered trigonal-prismatic polyhedra of SeNa6 are edge-shared and pass through a twofold rotation axis. Hence, this compound crystallizes in a centrosymmetric space group in contrast to the noncentrosymmetric structures adopted by the ALnQE(4) series of compounds. Raman and diffuse-reflectance spectra were also analyzed for the title compound.
引用
收藏
页码:5245 / 5247
页数:3
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