Studies in Mössbauer spectroscopy. Part 12. Characterization of complexes containing iron–silicon bonds

Abstract

Reactions between iron(0) and iron(II) tertiary phosphine complexes and silanes have been investigated. Only with the bidentate ligand Ph₂PCH₂CH₂PPh₂(dppe) could silyl derivatives be characterized; these are of the type [FeH(SiR₃)(dppe)₂] and [Fe(SiR₃)₂(dppe)₂][R₃=(OEt)₃, Cl₃, or MeCl₂]. From an analysis of the ⁵⁷Fe Mössbauer spectra, it seems likely that these complexes have trans configurations. The complexes [FeH(SiPh₃)(CO)₄] and [Fe(SiCl₃)₂(CO)₄] react with PPh₃ to give [Fe(CO)₄(PPh₃)] and SiPh₃H or Si₂Cl₆.