Cationic Iridium(III) Carbonyl Complexes: [Ir(CO)6]3+ and [Ir(CO)5Cl]2+


  • Financial support by National Science and Engineering Research Council (J. T. and F. A.), Deutsche Forschungsgemeinschaft (H. W.), NATO (H. W. and F. A.), and the Alexander-von-Humboldt-Foundation (F. A.) is gratefully acknowledged. We are thankful to the Degussa Company for a gift of Ir metal powder.


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The first homoleptic carbonyl cation of a tripositive metal, [Ir(CO)6]3+ (1), has been obtained as a thermally stable [Sb2F11] salt. The existence of 1 permits a comparison of the spectroscopic properties in the 5d series of isoelectronic hexacarbonyl species ranging from [Hf(CO)6]2− to [Ir(CO)6]3+. In addition the molecular structure of the related cation [Ir(CO)5Cl]2+ (2) is reported.