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Bicyclo[1.1.0]tetragermane-2,4-diide Diradicaloid.

Falk Ebeler1, Yury V Vishnevskiy1, Jan-Hendrik Lamm1

  • 1Molecular Inorganic Chemistry and Catalysis, Inorganic and Structural Chemistry, Center for Molecular Materials, Faculty of Chemistry, Universität Bielefeld, Universitätsstrasse 25, D-33615, Bielefeld, Germany.

Angewandte Chemie (International Ed. in English)
|August 7, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel bicyclo[1.1.0]tetragermane-2,4-diide compound with a Ge4 core. This germanium compound exhibits a singlet ground state and reacts with TEMPO and iron carbonyls, showcasing its unique reactivity.

Keywords:
CarbeneClusterDiradicaloidGermaniumMain groupStretched bond

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • Germanium clusters are underexplored compared to silicon analogues.
  • Anionic dicarbene ligands offer unique coordination environments for main group elements.
  • Exploring novel bonding motifs in low-valent germanium compounds is crucial.

Purpose of the Study:

  • To synthesize and characterize a novel bicyclo[1.1.0]tetragermane-2,4-diide.
  • To investigate the electronic structure and bonding of the Ge4 core.
  • To explore the reactivity of the tetragermane compound with radical and metal-containing reagents.

Main Methods:

  • Synthesis of a Ge4 core compound using GeCl4 and an alkyne-functionalized amidine.
  • KC8 reduction for the formation of the tetragermane-2,4-diide.
  • Density Functional Theory (DFT) and Complete Active Space Self-Consistent Field (CASSCF) calculations for electronic structure analysis.
  • Reactions with TEMPO and Fe2(CO)9 to probe reactivity.

Main Results:

  • Successful synthesis of the bicyclo[1.1.0]tetragermane-2,4-diide, [(ADC)Ge2]2, featuring a Ge4 core.
  • DFT and CASSCF calculations indicate a singlet ground state with a modest diradical character.
  • The compound undergoes Ge-Ge bond cleavage upon reaction with TEMPO and Fe2(CO)9.

Conclusions:

  • The study reports the first synthesis of a bicyclo[1.1.0]tetragermane-2,4-diide.
  • The electronic structure reveals interesting bonding characteristics of the Ge4 core.
  • The reactivity studies demonstrate the potential of this novel germanium compound in further synthetic transformations.