1359983-56-4Relevant academic research and scientific papers
Nickel pre-catalysts bearing [(N)-imidoylamidine] ligands; Influence of the presence of pyridine and pentafluorophenyl groups in ligand backboneon the reactivity in ethylene polymerizations
Peoples, Brian C.,Vega, Gala De la,Valdebenito, Carolina,Quijada, Raul,Ibannez, Andres,et al.
, p. 147 - 153 (2012/03/13)
In this contribution the synthesis and polymerization activity of the nickel complexes [NiBr2{N′-(2,6-diisopropylphenyl)-N-[1-(2,6- diisopropylphenylimine)ethyl]-N-(2,3,4,5,6-pentafluorophenyl)acetamidine}] (2), [NiBr2{N′-(2,6-diisopropylphenyl)-N-[1-(2,6- diisopropylphenylimine)ethyl]-N-(2,3,4,5,6-pentafluorophenylimine) ethylacetamidine}] (2a) and [NiBr2{N-(2,6-diisopropylphenyl)-N-[1-(2, 6-diisopropylphenylimine)]-N-(pyridin-4-yl)acetamidine}] (3) are reported. The variation of the phenyl substituents on the β amine was found to influence the polymerization activity of the complexes. The electron withdrawing/donating capacity of the substituted ring was foundto be correlated with the polymerization activity, with the pentafluoro substituted ring increasing the polymerization activity and the pyridin e ring decreasing the activity. The ligands and complexes were characterized using standard techniques and the polymer properties analyzed.
