Premium
α,α′‐Bis(arylimino)‐2,3:5,6‐bis(pentamethylene)pyridylcobalt Chlorides: Synthesis, Characterization, and Ethylene Polymerization Behavior
Author(s) -
Du Shizhen,
Zhang Wenjuan,
Yue Erlin,
Huang Fang,
Liang Tongling,
Sun WenHua
Publication year - 2016
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.201600098
Subject(s) - methylaluminoxane , chemistry , polymer chemistry , polymerization , ethylene , cobalt , catalysis , square pyramidal molecular geometry , pyridine , polyethylene , dispersity , crystal structure , metallocene , organic chemistry , polymer
A series of α,α′‐bis(arylimino)‐2,3:5,6‐bis(pentamethylene)pyridylcobalt chlorides was synthesized by the one‐pot template reaction of α,α′‐dioxo‐2,3:5,6‐bis(pentamethylene)pyridine, anilines, and cobalt chloride in refluxing acetic acid. The molecular structure of complex Co1 was determined by single‐crystal X‐ray crystallography, which revealed a distorted square‐pyramidal geometry around the cobalt center. On activation with methylaluminoxane or modified methylaluminoxane, all of the complexes exhibited high activity toward ethylene polymerization with activities in the range of 10 6 g of polyethylene (PE) per mole of Co per hour and produced highly linear PEs with low molecular weights and narrow polydispersity. The unimodal nature of the PEs indicated single‐site active species of these cobalt catalyst systems. The influences of cobalt complexes and polymerization parameters on the catalytic behavior and the properties of the PEs were investigated in detail.