Abstract
Contrary to a previous report it is shown that the mechanism of fluxionality of [Ir4(CO)11PEt3] may be explained by the Ligand Polyhedral Model (LPM). Two mechanisms both predicted by the LPM operate. First, the libration of the tetrahedral Ir4 unit within the icosahedral ligand polyhedron and secondly the polyhedral interconversion of the icosahedral ligand envelope through a cubeoctahedral transition state. The two act in unison. This approach offers a complete explanation of the observed experimental results.
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