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Electronic Effects of the Backbone on Bis(imino)pyridyliron(II)‐Catalyzed Ethylene Polymerization
Author(s) -
Guo Lihua,
Liu Yanlan,
Lian Kunbo,
Sun Wenting,
Zhu Huaxia,
Du Qing,
Liu Zhe,
Chen Xiaoyu,
Dai Shengyu
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800908
Subject(s) - methylaluminoxane , chemistry , ethylene , polymerization , catalysis , electronic effect , polymer chemistry , pyridine , polymer , ligand (biochemistry) , polar effect , photochemistry , medicinal chemistry , organic chemistry , metallocene , biochemistry , receptor
A series of bis(imino)pyridyl iron(II) complexes 1 – 5 with electron‐donating and ‐withdrawing substituents on the backbone of the ligand have been synthesized and characterized. Activated with methylaluminoxane (MAO), ethylene polymerization by these iron(II) complexes was investigated in detail, involving the electronic effect and influence of reaction conditions on catalyst activity and polymer molecular weight. The electronic perturbations exert great influence on the catalytic activity of ethylene polymerization. Complexes bearing electron‐withdrawing substituents in the 4‐position of the pyridine ring showed the better activity than analogues bearing electron‐donating substituents. However, no clear trend was observed for the dependence of polymer molecular weight on these substituents. In particular, the binuclear iron(III) complex 2′ we obtained by accident displayed a similar catalytic behavior compared to its iron(II) analogue complex 2 .