Determination of N-Heterocyclic Carbene [NHC] Steric and electronic parameters using the [(NHC)Ir(CO)2Cl] system

RA Kelly III, H Clavier, S Giudice, NM Scott, ED Stevens, J Bordner, I Samardjiev, CD Hoff, L Cavallo, Steven Patrick Nolan

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511 Citations (Scopus)


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)(2)Cl]. 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.

Original languageEnglish
Pages (from-to)202-210
Number of pages9
Issue number2
Early online date27 Dec 2007
Publication statusPublished - 28 Jan 2008


  • Olefin-Metathesis Catalysts
  • Metal-Complexes
  • Iridium Complexes
  • Room-Temperature
  • Suzuki-Miyaura
  • Structural Investigations
  • Phospha-Palladacycles
  • Homogeneous Catalysis
  • Buchwald-Hartwig
  • Ligands


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