The C6H4 ligands in the complexes Os3H(C6H4)-(PMe2)(CO)9(A) and Os3(C6H4)(PMe2)2(CO)7(B), synthesised from Os3(CO)12 and PMe2Ph, undergo rapid rotation relative to the Os3 ring, a process which necessitates a carbonyl transfer between osmium atoms in the case of complex (B)[ΔG(Tc)‡ values are 13·6 and 13·9 kcal mol–1 for (A) and (B) respectively].
A. J. Deeming, R. S. Nyholm and M. Underhill, J. Chem. Soc., Chem. Commun., 1972, 224 DOI: 10.1039/C39720000224
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