A Zwitterionic Heterobimetallic Gold–Iron Complex Supported by Bis(<i>N</i>‐Heterocyclic Imine)Silyliumylidene
Franziska Hanusch, Dominik Munz, Jörg Sutter, Karsten Meyer, Shigeyoshi Inoue
Abstract
Abstract The facile synthesis of the first bis‐ N ‐heterocyclic imine‐stabilized chlorosilyliumylidene 1 is reported. Remarkably, consecutive reaction of 1 with PPh 3 AuCl and K 2 Fe(CO) 4 gives rise to the unique heterobimetallic complex 1,2‐( Mes NHI) 2 ‐C 2 H 4 ‐ClSiAuFe(CO) 4 ( 4 ). The overall neutral complex 4 bears an unusual linear Si−Au−Fe structure and a rare anagostic interaction between the d 10 ‐configured gold atom and a CH bond of the mesityl ligand. According to the computational analysis and 57 Fe 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.