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Updated: Jun 21, 2025

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
Published on: February 11, 2012
Na[GeF5]·2HF: the first quarternary phase in the H-Na-Ge-F system.
Valentin Bockmair1, Constantin Hoch1, Irina Schusterbauer1
1Department Chemie, Ludwig-Maximilians Universität München, Butenandtstrasse 5-13 (Haus D), D-81377 München, Germany.
This study details the second crystal structure of trans-pentafluorogermanate anions in sodium trans-pentafluorogermanate(IV) bis(hydrogen fluoride). The structure features infinite chains of trans-linked octahedra and a network of distorted sodium polyhedra.
Area of Science:
- Inorganic Chemistry
- Crystal Engineering
- Solid-State Chemistry
Background:
- Previous work established the first crystal structures of μ-F-bridged pentafluorogermanates.
- The investigation of cis- or trans-bridged [GeF5]- anionic chains is an active area of research.
Purpose of the Study:
- To report the second crystal structure of trans-pentafluorogermanate anions.
- To characterize the crystal structure of sodium trans-pentafluorogermanate(IV) bis(hydrogen fluoride), Na[GeF5]·2HF.
Main Methods:
- Single-crystal X-ray diffraction analysis.
- Determination of crystallographic parameters (orthorhombic Pca21, a = 12.3786(3), b = 7.2189(2), c = 11.4969(3) Å, Z = 8).
Main Results:
- The crystal structure is composed of infinite chains of trans-linked [GeF6]2- octahedra along the b axis.
- A network of pentagonal bipyramidal distorted Na-centered polyhedra ([NaF7]) is observed.
- These [NaF7] polyhedra are linked via hydrogen fluoride molecules in a trans-edge fashion.
Conclusions:
- The study provides a detailed structural analysis of a novel trans-pentafluorogermanate compound.
- The findings offer insights into the coordination chemistry of germanium and sodium in the presence of fluoride and hydrogen fluoride.
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