Polynuclear carbonyl clusters containing heterocyclic hydrocarbons. The synthesis and X-ray crystal structure of [Os₃H(CO)₉(NMe₃) (μ-COC₄H₄N)] {μ-CONC₄H₄ = 2-acylpyrrole}

The reaction between the acyl-substituted triosmium cluster [Os₃H(CO)₁₀(μ-COC₄H₄N)] and trimethylamine-N-oxide, at -78°C, yields not the expected pyrrole-linked cluster but the novel trimethylamine complex [Os₃H(CO)₉(NMe₃)(μ-COC₄H ₄N)] (1). An X-ray crystal structure of the product shows that it consists of an η²-2-acylpyrrole bridged triosmium unit incorporating a terminally coordinated trimethylamine ligand which occupies an equatorial site on the osmium triangle.