SYNTHESIS AND REACTIVITY OF SILICON TRANS ITION-METAL .29. TRIHYDRIDOSILYL COMPLEXES OF IRON AND RUTHENIUM - SIMPLE SYNTHESIS, LIGAND-EXCHANGE REACTIONS ON METAL AND VIBRATION SPECTROSCOPIC ANALYSIS

The ferro- and ruthenio-trihydridosilanes (C(5)R(5))(OC)(2)M-SiH3 [R = H, M = Fe (3a), Ru (3b); R = Me, M = Fe (3c), Ru (3d)] are prepared v ia reaction of the ferro- and ruthenio-dichlorosilanes (C(5)R(5))(OC)( 2)M-SiHCl2 (2a-d) with LiAlH4 in Et(2)O. Photo-induced substitution of CO can be achieved in the case of 3a with Me(3)P (4a) or Ph(3)P (4b), leading to the formation of the phosphane-substituted ferro-trihydrid osilanes Cp(OC)(L)Fe-SiH3 [L = Me(3)P (5a), Ph(3)P (5b)] and Cp(Me(3)P )(2)Fe-SiH3 (6). The new silicon-transition metal complexes were chara cterized in detail spectroscopically (NMR, IR, Raman). The structure o f 3c has been determined by X-ray structural analysis.