[Ir4(CO)11(CNBut)] has been prepared and shown (by X-ray crystallography and 13C n.m.r. studies) to be the first example of a derivative of Ir4(CO)12 without bridging carbonyl groups; variable temperature 13C n.m.r. spectra establish carbonyl scrambling via a triply bridged intermediate, i.e., the formal inverse of the C3v→Td scrambling mechanism proposed for [Rh4(CO)12].
J. R. Shapley, G. F. Stuntz, M. R. Churchill and J. P. Hutchinson, J. Chem. Soc., Chem. Commun., 1979, 219 DOI: 10.1039/C39790000219
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