Determination of N-Heterocyclic Carbene (NHC) Steric and Electronic Parameters using the [(NHC)Ir(CO)2Cl] System

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• 作者：Roy A. Kelly III ; Hervé ; Clavier ; Simona Giudice ; Natalie M. Scott ; Edwin D. Stevens ; Jon Bordner ; Ivan Samardjiev ; Carl D. Hoff ; Luigi Cavallo ; Steven P. Nolan
• 刊名：Organometallics
• 出版年：2008
• 出版时间：January 28, 2008
• 年：2008
• 卷：27
• 期：2
• 页码：202 - 210
• 全文大小：1093K
• 年卷期：v.27,no.2(January 28, 2008)
• ISSN：1520-6041

文摘

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.