Add time:08/04/2019         Source:sciencedirect.com

The chlorobis(ethylene)iridium(I) dimer, [IrCl(C2H4)2]2 and acetylacetonatobis(ethylene)iridium(I), Ir(acac)(C2H4)2, react with C2F4 to give mixed ethylenetetrafluoroethylene complexes, in which the ethylene ligand may be replaced by alkenes such as cyclooctene and 1,5-cyclooctadiene. A number of neutral ligands can be added to these complexes with or without alkene substitution.In several complexes a strong IR-absorption in the region 1350–1500 cm−1 is found and attributed to (CC)-stretching vibration of the fluoro-alkene. From PMR-experiments with Ir(acac)(C2H4)2 and Ir(acac)(C2H4)(C2F4) it could be concluded that the rate of associative ethylene exchange and the barrier to rotation around the metal-ethylene bond were related to the basicity of the metal substrate. The process of alkene addition is discussed in terms of nucleophilic attack of the metal on the empty antibonding alkene-orbitals.

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