Activation Of Si-H Bond In Silazane Ligands With Iron And Cobalt Complexes Supported By Trimethylphosphine

Iron, cobalt belong to 4^th period, Ⅷ family of late transition metals. Because of their excellent coordination activity, low cost and relatively low toxicity to environment, these metals have been widely used in medicine, dyestuff, industrial catalysis and organic synthesis. Transition metal complexes can be stabilized by phosphine ligands and their catalytic activity and selectivity can be regulated by changing the phosphine ligands on the metal centers. Trimethylphosphine is one of the phosphine ligands which has strong coordination ability, small volume, special spectral signal. So it is usually applied in the design of catalysts and exploration of mechanism of organic reactions. Low-valent iron and cobalt complexes coordinated with trimethylphosphine showed relatively higher reactivity and selectivity.In recent years, silyl transition-metal complexes have raised great interest of scientists. The activation of Si-H bonds and oxidative addition to the metal center to generate silyl transition-metal compounds is one of the most important methods. Exploration of silyl transition-metal complexes may furnish a better insight into transition metal catalyzed reactions. Employed silazane compound as ligand has emerged as a new approach to generate silyl transition-metal complexes and the silazane has shown plentiful application from material industry to organic chemistry.In this thesis, we use pyridine as anchoring group to design different kinds of silazane ligands and combine with Fe（PMe₃）₄, Co（PMe₃）₄, CoMe（PMe₃）₄, CoCl（PMe₃）₃ to generate a series of new silyl transition-metal complexes through the activation of Si-H bonds.All of the new compounds were well characterized by 1HNMR、31PNMR、13CNMR、IR spectroscopy, elemental analysis and melting points test. The structures of single crystals were confirmed by X-ray diffraction.