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Novel nickel (II) complexes chelating β‐diketiminate ligands: synthesis and simultaneous polymerization and oligomerization of ethylene
Author(s) -
Li Yongfei,
Wang Lingyun,
Gao Haiyang,
Zhu Fangming,
Wu Qing
Publication year - 2006
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.1097
Subject(s) - chemistry , methylaluminoxane , nickel , ethylene , polymer chemistry , dimethoxyethane , polymerization , dimer , bromide , polyethylene , chelation , catalysis , inorganic chemistry , organic chemistry , polymer , metallocene , electrode , electrolyte
Two novel nickel (II) complexes, CH{C(CF 3 )NAr} 2 NiBr ( 1 , Ar = 2,6‐ i Pr 2 C 6 H 3 and 2 , 2,6‐Me 2 C 6 H 3 ), were synthesized by the reaction of the lithium salt of fluorinated β‐diketiminate backbone ligands with (1,2‐dimethoxyethane) nickel (II) bromide [(DME)NiBr 2 ]. The solid‐state structure of nickel (II) complex 2 as a dimer reveals four‐coordination and a tetrahedral geometry with bromide bridged by single crystal X‐ray measurement. Both complexes catalyze simultaneous polymerization and oligomerization of ethylene when activated by methylaluminoxane (MAO). It was found that the reaction temperature has a pronounced effect on the activity of ethylene polymerization and the molecular weight of obtained polyethylene. In addition, the nickel catalytic systems predominantly produce linear polyethylene with unsaturated end groups. Copyright © 2006 John Wiley & Sons, Ltd.