@article { ISI:000227509900026,
	title = {Highly active new alpha-diimine nickel catalyst for the polymerization of alpha-olefins},
	journal = {Journal of Organometallic Chemistry},
	volume = {690},
	number = {5},
	year = {2005},
	month = {MAR},
	pages = {1314-1323},
	publisher = {ELSEVIER SCIENCE SA},
	type = {Article},
	address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND},
	abstract = {<p>A new silylated alpha-diimine ligand, bis[N,N {\textquoteleft}-(4-tert-butyl-diphenylsilyl-2,6-diisopropylphenyl)imino]acenaphthene 3, and its corresponding Ni(II) complex, {bis[N,N {\textquoteleft}-(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.</p>},
	keywords = {alpha-diimine nickel complex, Ethylene polymerization, late transition-metal, propylene polymerization},
	issn = {0022-328X},
	doi = {10.1016/j.jorganchem.2004.11.046},
	author = {Liu, Hua-Rong and Gomes, P. T. and Costa, S. I. and Duarte, M. T. and Branquinho, R. and Fernandes, A. C. and Chien, J. C. W. and Singh, R. P. and Marques, Maria M.}
}
@article { ISI:000291393900002,
	title = {Polymerization of ethylene to branched poly(ethylene)s using ansa-eta(5)-monofluorenyl cyclohexanolato zirconium(IV) complex/methylaluminoxane},
	journal = {Polymer Bulletin},
	volume = {67},
	number = {3},
	year = {2011},
	month = {JUL},
	pages = {383-399},
	publisher = {SPRINGER},
	address = {233 SPRING ST, NEW YORK, NY 10013 USA},
	abstract = {<p>ansa-eta(5)-Monofluorenyl cyclohexanolato zirconium complex 3 was shown to be active for the polymerization of ethylene when activated with methylaluminoxane (MAO) at 5 bar. Up to a polymerization temperature of 40 A degrees C, 3/MAO resulted in linear poly(ethylene)s with saturated chain ends. However, at polymerization temperatures of 60, 80, and 100 A degrees C, a mixture of branched poly(ethylene)s, linear alpha-olefins and long chain alkanes was obtained. The poly(ethylene)s produced at 80 and 100 A degrees C exhibited a bimodal molecular weight distribution indicative of multiple active species. Very high molecular weight (M (v) \&gt; 5 x 10(5)) linear poly(ethylene)s were obtained using 3/MAO at 25 A degrees C.</p>},
	keywords = {ansa-Monofluorenyl complex, Bimodal MWD, Branched poly(ethylene)s, Ethylene polymerization, Methyl aluminoxane},
	issn = {0170-0839},
	doi = {10.1007/s00289-010-0387-6},
	author = {Rajesh, A. and Sivaram, S.}
}
