Abstract
The first cationic iridium complex supported by two bulky, ferrocenylated N-heterocyclic carbenes, [(1)2Ir(COD)]+[Cl]− ([2]+[Cl]−; 1 = 1-ferrocenylmethyl-3-mesitylimidazol-2-ylidene, Fc-NHC; COD = cis,cis-1,5-cyclooctadiene), was synthesized and characterized. Treatment of the aforementioned complex with a mixture of [N(nBu)4]+[Cl]− and [Ir(COD)(Cl)]2 afforded [(1)2Ir(COD)]+[Ir(COD)(Cl)2]− ([2]+[Ir(COD)Cl2]−), which featured cationic as well as anionic Ir centers. Electrochemical analysis of [2]+[Ir(COD)Cl2]− revealed that the complex displayed two reversible (iron- and iridium-centered) and two irreversible (iridium-centered) redox processes, which were assigned to the cationic and anionic components, respectively. Stirring [2]+[Ir(COD)Cl2]− under an atmosphere of carbon monoxide generated the corresponding Ir carbonyl complex [(1)2Ir(CO)2]+[Ir(CO)2(Cl)2]− ([3]+[Ir(CO)2Cl2]−). Cyclic voltammetry (CV) measurements of the aforementioned complexes containing [(1)2Ir(COD)]+ showed that the iron-centered oxid...
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