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d8 Rhodium and Iridium Complexes of Corannulene

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posted on 23.08.2006, 00:00 by Jay S. Siegel, Kim K. Baldridge, Anthony Linden, Reto Dorta
[(COE)2M]+ fragments (M = Rh, Ir; COE = cyclooctene) react with corannulene to give η6-bound complexes [(COE)2Rh(η6-C20H10)]PF6 and [(COE)2Ir(η6-C20H10)]PF6. Both compounds were characterized by X-ray diffraction studies, and binding in the solid state is compared with that of their aromatic analogues [(COE)2M(η6-arene)]PF6 (aryl = benzene and phenanthrene). Solution NMR studies show that the [(COE)2Rh]+ fragment walks over the curved aromatic surface of corannulene, whereas the Ir analogue is not fluxional. Experimental as well as computational studies suggest that inter-ring movement of the Rh complex follows a hub migration mechanism. Initial reactivity studies indicate that the [(COE)2M]+ fragments can undergo chemical transformations, such as transfer dehydrogenation and substitution reactions, while still bound to corannulene.