Functionalized N-heterocyclic carbene iridium complexes: Synthesis,structure and addition polymerization of norbornene |
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Authors: | Xu-Qiong Xiao Guo-Xin Jin |
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Institution: | Shanghai Key Laboratory of Molecular Catalysis and Innovative Material, Department of Chemistry, Fudan University, Shanghai 200433, China |
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Abstract: | Picolyl, pyridine, and methyl functionalized N-heterocyclic carbene iridium complexes Cp1Ir(C^N)Cl]Cl (4, C^N = 3-Methyl-1-picolyimidazol-2-ylidene), Cp1Ir(C^N)Cl]Cp1IrCl3] (5), Cp1Ir(C-N)Cl]Cl (6, C-N = 3-Methyl-1-pyridylimidazol-2-ylidene) and Cp1Ir(L)Cl2] (7, L = 1,3-dimethylimidazol-2-ylidene) have been synthesized by transmetallation from Ag(I) carbene species, and characterized by 1H NMR, 13C NMR spectra and elemental analyses. The molecular structures of 5–7 have been confirmed by X-ray single-crystal analyses. The iridium carbene complexes 4 and 6 show moderate catalytic activities (3.03 × 105 g PNB (mol Ir)?1 h?1 and 1.70 × 106 g PNB (mol Ir)?1 h?1) for the addition polymerization of norbornene in the presence of methylaluminoxane (MAO) as co-catalyst. The produced polynorbornene have been characterized by IR, 1H NMR and 13C NMR spectra, showing it follows the vinyl-addition-type of polymerization. |
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