Boranyl-Functionalized [Ge9] Clusters : Providing the Idea of Intramolecular Ge/B Frustrated Lewis Pairs

Christoph Wallach, Felix S. Geitner, Antti J. Karttunen, Thomas F. Fässler*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)
33 Downloads (Pure)


The unique three-dimensional structure of spherical, homoatomic nine-atom germanium clusters opens various possibilities for the spatial arrangement of functional groups. Ligands comprising lone pairs have recently been introduced in the cluster sphere, and we now report the addition of a boranyl group to the cluster featuring a Ge−B exo-cluster bond. The reaction of the twofold-silylated cluster [Ge9{Si(TMS)3}2]2− (TMS=trimethylsilyl) with 2-chloro-1,3,2-diazaborolidines DABR-Cl leads to the first boranyl-functionalized [Ge9] clusters [Ge9{Si(TMS)3}2DABR] (R=methyl (1 a), iso-propyl (2 a), ortho-tolyl (3 a)). The anions 2 a and 3 a were structurally characterized as [NHCDippCu]+ complexes (NHCDipp=1,3-di(2,6-diisopropylphenyl)imidazolylidine) through single crystal X-ray structure determination. Quantum-chemical calculations manifest the frustrated Lewis pair (FLP) character of the boranyl-functionalized cluster [Ge9{Si(TMS)3}2BCy2] (4 a).

Original languageEnglish
Pages (from-to)2648-2653
Number of pages6
JournalAngewandte Chemie - International Edition
Issue number5
Early online date14 Oct 2020
Publication statusPublished - 1 Feb 2021
MoE publication typeA1 Journal article-refereed


  • boranes
  • cluster compounds
  • germanium
  • Lewis base
  • Zintl cluster


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