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η 3 ‐Benzyl‐Nickel‐Diimine Complex: Synthesis and Catalytic Properties in Ethylene Polymerization
Author(s) -
Fassina Viviane,
Ramminger Carolina,
Seferin Marcus,
Mauler Raquel S.,
de Souza Roberto F.,
Monteiro Adriano L.
Publication year - 2003
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200350009
Subject(s) - methylaluminoxane , diimine , ethylene , polymerization , polymer chemistry , catalysis , crystallinity , nickel , chloride , chemistry , yield (engineering) , polymer , materials science , metallocene , organic chemistry , crystallography , metallurgy
The oxidative addition of benzyl chloride to Ni(cod) 2 in the presence of 1,4‐bis(2,6‐diisopropylphenyl)acenaphthenediimine followed by chloride abstraction affords [( η 3 ‐CH 2 C 6 H 5 )Ni( α ‐diimine)][PF 6 ] ( α ‐diimine = 1,4‐bis(2,6‐diisopropylphenyl)acenaphthenediimine) in 70% yield. The complex is active in ethylene polymerization in the presence of methylaluminoxane and under mild reaction conditions. The polyethylenes obtained are highly branched, have very low densities, do not show T m or measurable crystallinity and have molecular weights ranging from 80 × 10 3 to 290 × 10 3 g · mol −1 .