Nickel and palladium complexes bearing ortho-phenoxy modified anilido-imine ligands: Drastic steric effect on coordinated geometry, and catalytic property toward olefin polymerization

作者：Long, Jie-ming; Gao, Hai-yang^*; Liu, Feng-shou; Song, Ke-ming; Hu, Hao; Zhang, Ling; Zhu, Fang-ming; Wu, Qing

来源：Inorganica Chimica Acta, 2009, 362(9): 3035-3042.

DOI：10.1016/j.ica.2009.01.037

• Anilido-imine ligands
• Nickel complexes
• Palladium complexes
• Norbornene polymerization

A series of new nickel complexes and palladium complexes bearing ortho-phenoxy modified anilido-imine ligands have been synthesized and characterized. X-ray diffraction analyses of the single crystal structures reveal that there are no direct metal-O interactions in all of the complexes. The steric hindrance of complexes has an importance influence on their coordinated geometries. The bulky complexes with 2,6-diisopropylphenyl substituent exist as a dimers with bromine-bridged structure while those with 2,6-dimethylphenyl or phenyl substituents adopt a distorted tetrahedral geometry with four nitrogen atoms of two anilido-imine ligands. The nickel complexes exhibited high activity up to 7.33 x 10(6) g/(mol of Ni center dot h) and palladium complexes showed very high activity up to 2.63 x 10(8) g/(mol of Pd center dot h) for norbornene polymerization with methylaluminoxane as cocatalyst. The nickel catalysts were attempted to polymerize ethylene at atmosphere pressure, however, only oligomers were produced.

• 出版日期2009-7-1
• 单位中山大学