Novel Nickel Catalysts Containing Tetradentate Chelating Ligands for the Polymerization of Norbornene

Bulletin of the Korean chemical society

Jun Yong Lee¹  Ik-Mo Lee¹  Dong Hwan Lee¹  Youngmee Kim¹  Cheal Kim¹  Ji Young Ryu¹ 

关键词: Nickel complexes;    Tetradentate ligands;    4;    5-Substituted-1;    2-bis(pyridine-2-carboxamide)-benzene;    MMAO;    Norbornene polymerization;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

New nickel complexes containing novel tetradentate ligands, 4,5-substituted-1,2-bis(pyridine-2-carboxamide)-benzene ligands but lacking alkyl or halide ligands in the coordination sphere have been prepared. They were activated with MMAO (modified methylaluminoxane) to be proven as efficient catalysts for the polymerization of norbornene. Both electron-donating and -withdrawing substituents on the benzene ring and polar solvents enhance the catalytic activity for olefin polymerization. Improvement in thermal stability of the complexes was observed. Some of these complexes were crystallographically determined to have square planar geometry. A plausible mechanism involving dissociation of ligands is proposed.

【 授权许可】

Unknown