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Synthesis and reactivity of new bis(N-heterocyclic carbene) iridium(I) complexes

Nelson, David J. and Truscott, Byron J. and Slawin, Alexandra M Z and Nolan, Steven P. (2013) Synthesis and reactivity of new bis(N-heterocyclic carbene) iridium(I) complexes. Inorganic Chemistry, 52 (21). pp. 12674-12681. ISSN 0020-1669

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New complexes of the type trans-[IrCl(η2-COE)(NHC) 2] (COE = cis-cyclooctene; NHC = N-heterocyclic carbene) have been prepared in one step from the reaction of ca. 4 equiv of NHC or [AgCl(NHC)] with [IrCl(η2-COE)2]2 in benzene. These new complexes have been characterized by techniques including NMR and IR spectroscopy, X-ray crystallography, and elemental analysis. Exposing trans-[IrCl(COE)(IiPrMe)2] to CO yielded trans-[IrCl(CO)(IiPrMe)2], which is the only bis(NHC) analogue of Vaska's complex trans-[IrCl(CO)(PPh3) 2] known to date. The synthesis of trans-[Ir(CO)(IiPr Me)2(R)] (R = MeO, PhCC, OSiPh3, O 2CPh) complexes has been achieved via deprotonation reactions involving the new hydroxide species trans-[Ir(OH)(CO)(IiPr Me)2].