|
|||||
|
|
Mono and bimetallic nickel bromide complexes bearing azolate-imine ligands: Synthesis, structural characterization and ethylene polymerization studies |
|
| Authors: | Rodrigo Caris Mauricio Valderrama Rene Rojas |
| Institution: | a Departamento de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago-22, Chile b Centro para la Investigación Interdisciplinaria Avanzada en Ciencias de Materiales (CIMAT), Chile c Departments of Chemistry and Materials, University of California, Santa Barbara, CA 93106, United States |
| Abstract: | The 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(μ-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. |
| Keywords: | Nickel Azolate-imine ligands Ethylene polymerization Branching PE Late transition metal catalysts |
| 本文献已被 ScienceDirect 等数据库收录！ | |