Highly active new alpha-diimine nickel catalyst for the polymerization of alpha-olefins

TitleHighly active new alpha-diimine nickel catalyst for the polymerization of alpha-olefins
Publication TypeJournal Article
Year of Publication2005
AuthorsLiu, H-R, Gomes, PT, Costa, SI, Duarte, MT, Branquinho, R, Fernandes, AC, Chien, JCW, Singh, RP, Marques, MM
JournalJournal of Organometallic Chemistry
Volume690
Issue5
Pagination1314-1323
Date PublishedMAR
Type of ArticleArticle
ISSN0022-328X
Keywordsalpha-diimine nickel complex, Ethylene polymerization, late transition-metal, propylene polymerization
Abstract

A new silylated alpha-diimine ligand, bis[N,N `-(4-tert-butyl-diphenylsilyl-2,6-diisopropylphenyl)imino]acenaphthene 3, and its corresponding Ni(II) complex, {bis[N,N `-(4-tert-butyl-diphenylsilyl-2,6-diisopropylphenyl)imino]acenaphthene} dibromonickel 4, have been synthesized and characterized. The crystal structures of 3 and 4 were determined by X-ray crystallography. In the solid state, complex 4 is a dimer with two bridging Br ligands linking the two nickel centers, which have square pyramidal geometries. Complex 4, activated either by diethylaluminum chloride (DEAC) or methylaluminoxane (MAO) produces very active catalyst systems for the polymerization of ethylene and moderately active for the polymerization of propylene. The activity values are in the order of magnitude of 10(7) g PE (mol Ni [E] h)(-1) for the polymerization of ethylene and of 10(5) g PP (mol Ni [P] h)(-1) for the polymerization of propylene. NMR analysis shows that branched polyethylenes (PE) are obtained at room or higher temperatures and almost linear PE is obtained at 0 degrees C with 4/DEAC. (c) 2004 Elsevier B.V. All rights reserved.

DOI10.1016/j.jorganchem.2004.11.046
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

2.336

Divison category: 
Polymer Science & Engineering