Silicon–transition metal compounds. Part III. Reactions of silyltetracarbonylcobalt and silylpentacarbonylmanganese with Lewis bases of nitrogen and phosphorus

Abstract

Silyltetracarbonylcobalt and silylpentacarbonylmanganese form 1 : 2 adducts with trimethylamine and pyridine (py), and 1 : 1 adducts with 2,2′-bipyridyl (bipy). Stabilities are inferred to lie in the probable orders: SiH₃Co(CO)₄ > SiH₃Mn(CO)₅ and NMe₃ > py ∼ bipy. I.r. studies of the solid adducts suggest an ionic structure, (SiH₃,2B)⁺[M(CO)_n]^–. Unlike SiH₃Mn(CO)₅, SiH₃Mn(CO)₅,2py reacts readily with HCl to give SiH₃Cl. Ammonia reacts with gaseous SiH₃Co(CO)₄ and SiH₃Mn(CO)₅ to give (SiH₃)₂NH and its decomposition products; neither PH₃ nor PF₃ reacts at room temperature.