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Complexes of iridium bearing NHC (NHC = N-heterocyclic carbene) ligands were synthesized and fully characterized. The series (NHC)Ir(cod)Cl were obtained by simple cleavage of Ir(cod)Cl2. The (NHC)Ir(cod)Cl complexes were reacted with excess carbon monoxide, leading to (NHC)Ir(CO)2Cl. The infrared carbonyl stretching frequencies of these were recorded to quantify the electronic parameter of NHC ligands. X-ray diffraction study results allow for determination of NHC steric parameters within this series. These data allow for comparison with other ligand families.
Kelly et al. (Thu,) studied this question.
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