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An Unprecedented (1infinity)

Downie¹, Tang, Guloy

¹Department of Chemistry University of Houston Houston, TX 77204-5641 (USA).

Angewandte Chemie (International Ed. in English)

|January 29, 2000

Summary

Researchers created a novel chain of germanium clusters, forming a semiconducting "wire." This discovery challenges existing theories on cluster behavior and links molecular ions to extended Zintl phases and nanomaterials.

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Area of Science:

Materials Science
Inorganic Chemistry
Solid-State Chemistry

Background:

Zintl phases are known for their unique structures and properties.
Germanium clusters exhibit diverse structural motifs and reactivity.
Polymerization of molecular clusters is a key area in materials synthesis.

Purpose of the Study:

To synthesize and characterize a novel polymeric Zintl anion composed of vertex-linked "bare" nido-Ge(9)(2-) clusters.
To investigate the counterintuitive polymerization of nido-Ge(9)(4-) clusters.
To establish links between molecular Zintl cluster ions and extended Zintl phases.

Main Methods:

Synthesis using KGe(4), ethylenediamine, and [18]crown-6.
Characterization of the resulting polymeric structure.
Analysis of the electronic properties of the cluster "wire".

Main Results:

Formation of a novel chain of vertex-linked "bare" nido-Ge(9)(2-) clusters.
Demonstration of counterintuitive polymerization of nido-Ge(9)(4-) clusters, deviating from expected two-electron oxidation behavior.
Creation of a semiconducting cluster "wire" with direct structural and mechanistic links to Zintl phases.

Conclusions:

The study presents a new class of extended Zintl materials based on germanium clusters.
The findings challenge established principles of cluster chemistry and oxidation states.
The novel cluster "wire" serves as a bridge between molecular and extended solid-state chemistry.

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