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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

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Published on: February 11, 2012

GeTe(2)O(6), a germanium tellurate(IV) with an open framework.

Nefla Jennene Boukharrata¹, Philippe Thomas, Jean-Paul Laval

¹Science des Procédés Céramiques et de Traitements de Surface, UMR-CNRS 6638, Université de Limoges, Faculté des Sciences et Techniques, 123 Avenue A. Thomas, Limoges 87060, France.

Acta Crystallographica. Section C, Crystal Structure Communications

|May 2, 2009

Summary

Researchers characterized a new Germanium Ditellurate (GeTe2O6) phase, revealing isolated Germanium-Oxygen octahedra and Tellurium-Oxygen units. This discovery advances understanding of tetravalent tellurate structures and their relation to known crystal types.

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Published on: July 17, 2020

Area of Science:

Inorganic Chemistry
Crystallography
Solid-State Chemistry

Background:

The Germanium Ditellurate (GeTe2O6) phase was previously evidenced but uncharacterized.
Existing AB(2)X(6) structures often feature B cations with stereochemically active lone pairs, influencing their properties.

Purpose of the Study:

To elucidate the crystal structure of the uncharacterized GeTe2O6 phase.
To classify this new structure within the broader context of tetravalent tellurates and related compounds.

Main Methods:

Single-crystal X-ray diffraction analysis was employed to determine the atomic arrangement.
The crystal structure was solved and refined within the P2(1)/n space group.

Main Results:

The structure comprises isolated GeO(6) octahedra linked by isolated TeO(3) units.
Germanium cations occupy a site with C1 symmetry, while Te and O atoms are in general positions.
This represents a novel tetravalent tellurate structure type.

Conclusions:

The determined GeTe2O6 structure is distinct from other AB(2)X(6) compounds lacking active lone pairs.
The structure is derived from the pseudo-hexagonal MI(2)O(6) type, exhibiting significant monoclinic distortion due to the smaller Ge(4+) size compared to divalent M cations.