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Determination of N-Heterocyclic Carbene (NHC) Steric and Electronic Parameters using the [(NHC)Ir(CO)<sub>2</sub>Cl] System
Organometallics · 2007 · Vol. 27(2) · pp. 202–210
Roy A. Kelly✉(University of New Orleans)Hervé Clavier(University of New Orleans)S. Giudice(University of Miami)Natalie Scott(Institut Català d'Investigació Química)Edwin D. Stevens(University of New Orleans)Jon Bordner(Institut Català d'Investigació Química)I. Samardjiev(University of New Orleans)Carl D. Hoff(University of Miami)Luigi Cavallo(University of New Orleans)Steven P. Nolan(University of New Orleans)
Abstract
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)Cl]2. 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.
N-Heterocyclic Carbenes in Organic and Inorganic ChemistryCatalytic Cross-Coupling ReactionsSynthetic Organic Chemistry MethodsCarbeneChemistrySteric effectsIridiumLigand (biochemistry)Carbon monoxideInfraredInfrared spectroscopyMedicinal chemistryCleavage (geology)
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