A Nickel Complex Containing a Pyramidalized, Ambiphilic Pincer Germylene Ligand

Takahito Watanabe, Yumi Kasai, Hiromi Tobita

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24 Citations (Scopus)


Reaction of N-heterocyclic carbene (NHC)-stabilized PGeP-type germylene Ge{o-(PiPr2)C6H4}2MeIiPr (1) (MeIiPr=1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene) with Ni(cod)2 gave pincer germylene complex Ni[Ge{o-(PiPr2)C6H4}2](MeIiPr) (2), in which the Ge center of 2 is significantly pyramidalized. Theoretical calculation on 2 predicted the ambiphilicity of the germanium center, which was confirmed by reactivity studies. Thus, complex 2 reacted with both Lewis base MeIMe (MeIMe=1,3,4,5-tetramethylimidazol-2-ylidene) and Lewis acid BH3⋅SMe2 at the germanium center to afford the adducts Ni[Ge{o-(PiPr2)C6H4}2MeIMe](MeIiPr) (3) and Ni[Ge{o-(PiPr2)C6H4}2⋅BH3](MeIiPr) (4), respectively. Furthermore, the former was slowly converted to dinuclear complex Ni2[Ge{o-(PiPr2)C6H4}2]2(MeIMe)2 (5) at room temperature. Complex 5 can be regarded as a dimer of the MeIMe analog of 2 with a Ni-Ge-Ge-Ni linkage.

Original languageEnglish
Pages (from-to)13491-13495
Number of pages5
JournalChemistry - A European Journal
Issue number59
Publication statusPublished - 2019 Oct 22


  • ambiphilic ligands
  • germanium
  • germylenes
  • nickel
  • pincer ligands


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