A Zwitterionic Heterobimetallic Gold–Iron Complex Supported by Bis(N-Heterocyclic Imine)Silyliumylidene

Franziska Hanusch, Dominik Munz, Jörg Sutter, Karsten Meyer, Shigeyoshi Inoue

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The facile synthesis of the first bis-N-heterocyclic imine-stabilized chlorosilyliumylidene 1 is reported. Remarkably, consecutive reaction of 1 with PPh3AuCl and K2Fe(CO)4 gives rise to the unique heterobimetallic complex 1,2-(MesNHI)2-C2H4-ClSiAuFe(CO)4 (4). The overall neutral complex 4 bears an unusual linear Si−Au−Fe structure and a rare anagostic interaction between the d10-configured gold atom and a CH bond of the mesityl ligand. According to the computational analysis and 57Fe Mössbauer spectroscopy, the formal Fe-oxidation state remains at −II. Thus, the electronic structure of 4 is best described as an overall neutral—yet zwitterionic—heterobimetallic “Si(II)+-Au(I)+-Fe(-II)2−”-silyliumylidene complex, derived from double anion exchange. The computational analysis indicates strong hyperconjugative back donation from the gold(I) atom to the silyliumylidene ligand.

Original languageEnglish
Pages (from-to)23274-23280
Number of pages7
JournalAngewandte Chemie International Edition in English
Issue number43
StatePublished - 18 Oct 2021


  • anagostic interactions
  • gold
  • iron
  • silicon
  • zwitterionic complexes


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