Photolysis of a C6D6 solution of the (aminodisilanyl)iron complex Cp′Fe(CO)2SiMe2SiMe2-NEt2 (Cp′ = η-C5Me5) resulted in the formation of the amino-bridged bis(silylene)iron complex 1. The 29Si NMR spectrum of 1 shows a signal at very low field (94.0 ppm). X-ray crystal structure analysis of 1 (monoclinic, space group P21/a, a = 28.031(8) Å, b = 19.541(6) Å, c = 8.089(3) Å, β = 93.62(2)°, V = 4422(3) Å3, Z = 8) revealed very short Fe-Si bonds (2.22–2.23 Å), fairly long Si—N bonds (1.93–1.96 Å), and almost planar geometry at each silicon atom with respect to it and the attached C and Fe atoms, excluding the bridging nitrogen. These structural and spectroscopic data for 1 strongly indicate that the Fe-Si bonds take on partial double-bond character (bis(silylene) structure), while the Si-N bonds can be described as a hybrid of a covalent and weak dative bond.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry