X-Ray crystal structure and dynamic behaviour of [Ir4(CO)11(CNBut)]

Abstract
[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 C3vTd scrambling mechanism proposed for [Rh4(CO)12].

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