Methanolothermale Synthese und Kristallstruktur von Diselenido- und Ditelluridogermanaten(IV) der Alkalimetalle K – Cs / M ethanolothermal Synthesis and Crystal Structure of Diselenido- and Ditelluridogerm anates(IV) of the Alkali Metals K – Cs

W. S. Sheldrick; B. Schaaf

doi:10.1515/znb-1995-1007

Open Access Published by De Gruyter June 2, 2014

Methanolothermale Synthese und Kristallstruktur von Diselenido- und Ditelluridogermanaten(IV) der Alkalimetalle K – Cs / M ethanolothermal Synthesis and Crystal Structure of Diselenido- and Ditelluridogerm anates(IV) of the Alkali Metals K – Cs

W. S. Sheldrick and B. Schaaf

From the journal Zeitschrift für Naturforschung B

https://doi.org/10.1515/znb-1995-1007

Methanolothermal reaction of M₂CO₃ (M = K, Rb) with Ge and Se yields respectively the diselenidogermanates(IV) K₂GeSe₄ and Rb₂GeSe₄, both of which contain chain anions ¹_∞[GeSe₄^2-] in which GeSe₄ tetrahedra are linked via Se-Se bonds. A similar structural principle is found in the ditelluridogermanates(IV) Rb₂GeTe₄ and Cs₂GeTe₄, prepared by reaction of M₂CO₃ (M = Rb, Cs) with Ge and Te in methanol at temperatures of respectively 200 and 160 °C. The effect of cation size on the chain conformation is discussed. Rb₄Ge₄Se₁₀ · CH₃OH, which is formed together with Rb₂GeSe₄, exhibits isolated anions [Ge₄Se₁₀]^4- with an adamantane-like structure.

Keywords: Selenidogermanates(IV); Telluridogermanates(IV); Alkali Cations; Methanolothermal Synthesis; Crystal Structure

Published Online: 2014-6-2

Published in Print: 1995-10-1

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Methanolothermale Synthese und Kristallstruktur von Diselenido- und Ditelluridogermanaten(IV) der Alkalimetalle K – Cs / M ethanolothermal Synthesis and Crystal Structure of Diselenido- and Ditelluridogerm anates(IV) of the Alkali Metals K – Cs

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