Abstract
The fluxional behavior of [Ir 4(CO) 10( cis-Ph 2PCH=CHPPh 2)] ( I) and [Ir 4(CO) 8( cis-Ph 2PCH=CHPPh 2) 2] ( II) has been investigated by 13C and 31P NMR. Cluster I exists in solution as an equilibrium mixture of two geometrical isomers. Both isomers are fluxional due to two independent CO scrambling processes, and their interconversion is due to a slower P atom intramolecular migration from one metal centre to another. In contrast, the pairwise exchange of the P atoms in cluster II is not due to P atom migration but is the consequence of two parallel CO site exchange processes.
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