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"Excess" electrons in LuGe.

Riccardo Freccero1, Julia-Maria Hübner1, Yurii Prots1

  • 1Abteilung Chemische Metallkunde, Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187, Dresden, Germany.

Angewandte Chemie (International Ed. in English)
|November 25, 2020
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Summary
This summary is machine-generated.

Lutetium monogermanide (LuGe) was synthesized under high pressure. Unexpected lutetium-lutetium bonds form, indicating a polycationic structure, despite the material following the extended 8-N rule.

Keywords:
chemical bondinggermaniumhigh-pressure synthesisintermetallic compoundlutetium

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Inorganic Chemistry

Background:

  • High-pressure synthesis enables the discovery of novel materials with unique structures and properties.
  • Understanding chemical bonding in intermetallic compounds is crucial for predicting their behavior.

Purpose of the Study:

  • To synthesize and characterize the monogermanide lutetium germanide (LuGe).
  • To investigate the chemical bonding and electronic structure of LuGe using quantum-chemical methods.

Main Methods:

  • High-pressure, high-temperature synthesis (5-15 GPa, 1023-1423 K).
  • Single-crystal X-ray diffraction for crystal structure determination.
  • Quantum-chemical calculations in position space for bonding analysis.

Main Results:

  • Lutetium monogermanide (LuGe) was successfully synthesized and its crystal structure determined (FeB type, Pnma).
  • Analysis revealed 2c-Ge-Ge bonds within a germanium polyanion and unexpected four-atomic lutetium-lutetium bonds.
  • The bonding indicates a polycationic structure (Lu³⁺(2b)Ge²⁻ × 1e⁻) and follows the extended 8-N rule.

Conclusions:

  • The formation of lutetium-lutetium bonds in LuGe is a significant finding, driven by excess electrons.
  • This study highlights the utility of high-pressure synthesis for exploring new bonding motifs in intermetallic compounds.