Destruction of Non-Centrosymmetry through Chalcogenide Salt Inclusion

Author

Amitava Choudhury, Missouri University of Science and TechnologyFollow
Peter K. Dorhout

Abstract

A salt-inclusion samarium selenogermanate compound, NaSmGe-Se ₄·0.25Na₂Se was isolated from a reaction of Na ₂Se, Sm, GeSe₂, and Se. The new structure consists of isolated GeSe₄ units and bicapped trigonal-prismatic SmSe ₈, 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 ALnQE₄ series of compounds. Raman and diffuse-reflectance spectra were also analyzed for the title compound.

Recommended Citation

A. Choudhury and P. K. Dorhout, "Destruction of Non-Centrosymmetry through Chalcogenide Salt Inclusion," Inorganic Chemistry, vol. 45, no. 14, pp. 5245 - 5247, American Chemical Society (ACS), Jul 2006.

The definitive version is available at https://doi.org/10.1021/ic060294a

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0020-1669

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2006 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Jul 2006