1.Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
changle@ustc.edu.cn
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Chen Tan, Wen-Min Pang, Chang-Le Chen. A Phenol-containing
Chen Tan, Wen-Min Pang, Chang-Le Chen. A Phenol-containing
A phenol-containing dibenzhydryl-based ,α,-diimine ligand bearing hydroxy group on ,para,-position of aniline moiety was designed, synthesized, and investigated in Ni- and Pd-catalyzed ethylene polymerization. The Ni complex bearing hydroxy groups resulted in not only high polyethylene molecular weight (,M,n, up to 1.5 × 10,6,), but also significantly increased melting temperature (,T,m, up to 123 °C) and greatly decreased branching density (33/1000C) versus the Ni catalyst bearing OMe group on ,para,-position of aniline moiety. This is consistent with the hypothesis that the deprotonation of the phenol moiety generated a phenoxide bearing strong electron-donating O,−, substituent by methylaluminoxane (MAO) cocatalyst. The Pd complexes bearing hydroxy groups exhibited similar catalytic properties to those of the Pd catalyst bearing OMe groups did.
α-DiimineEthylene polymerizationElectronic effectPalladiumNickel
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CCDC 1887662 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre.
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