Abstract
Acetonitrile forms primarily N-coordination complexes (M←NCCH3) with Os and Re metal atoms, but these metal atoms produce exclusively methylidyne complexes (HC≡MH2X) in similar previous reactions with small alkanes and halomethanes. The Os complex increases on visible photolysis and dissociates partially on UV irradiation without the generation of other new products, whereas the Re complex converts to other products (CH3–ReNC, CH2═Re(H)NC, and CH≡Re(H)2NC) on photolysis. The primary formation of the N-coordination complex originates from its stability relative to that of the nitrile π-complex in these systems. The agostic interaction in the methylidene complex is apparently insignificant, and this rare observation of a methylidyne product with Re reflects that H migration in the isocyanide system is less favorable than those in the hydride and halide analogues. Experiments with Mn gave weaker counterpart product absorptions.
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