Browsing by Author "Wu, Guang"
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- ItemBinding modes of a dimethyliminopentanone ligand on nickel pre-catalysts toward olefin polymerization(2009) Boardman, Brycelyn M.; Wu, Guang; Rojas Guerrero, René; Bazan, Guillermo C.
- ItemMono and bimetallic nickel bromide complexes bearing azolate-imine ligands: Synthesis, structural characterization and ethylene polymerization studies(ELSEVIER SCIENCE SA, 2009) Caris, Rodrigo; Peoples, Brian C.; Valderrama, Mauricio; Wu, Guang; Rojas, ReneThe synthesis of N-(1-(3,5-dimethylpyrazol-1-yl)ethylidene)-2,6-diisopropylaniline (1) and N-(1-(indazol-2-yl)ethylidene)-2,6-diisopropylaniline (2) allowed access to new transition metal complexes. When reacted with dibromo(2,2'-dimethoxyethylether) nickel(II) the complexes [NiBr2{N-(1-(3,5-dimethylpyrazol-1-yl) ethylidene)-2,6-diisopropylaniline}] (3) and [Ni2Br2(mu-Br)2{N-(1-(indazol-1-yl)ethylidene)-2,6-diisopropylaniline} 2] (4) are yielded, respectively. The addition of MAO generates catalytically active species for the homopolymerization of ethylene. The polymer products were low molecular weight (3-6 K) and a monomodal molecular weight distribution, consistent with the presence of a single active site. In addition, the catalyst was found to efficiently oligomerize higher olefins to high molecular weights with narrow PDIs. (C) 2009 Elsevier B.V. All rights reserved.
- ItemNickel alpha-Keto-beta-Diimine Initiators for Olefin Polymerization(WILEY-V C H VERLAG GMBH, 2009) Azoulay, Jason D.; Rojas, Rene S.; Serrano, Abigail V.; Ohtaki, Hisashi; Galland, Griselda B.; Wu, Guang; Bazan, Guillermo C.(Figure Presented) A new ligand-metal combination (see picture, Ni green, Br brown, N blue, O red, C gray) was designed to be cationic and to benefit from removal of electron density by the action of a Lewis acid on the ligand framework. In the presence of various activators, the resulting catalytic site is highly active for ethylene polymerization and capable of polymerizing α-olefins to high molecular weights. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.
- ItemSingle-component alpha-iminocarboxamide nickel ethylene polymerization and copolymerization initiators(2007) Rojas Guerrero, René; Galland, Griselda Baffera; Wu, Guang; Bazán, Guillermo C.