@article {1381,
	title = {Synthesis, characterisation and solid state structures of alpha-diimine cobalt(II) complexes: Ethylene polymerisation tests},
	journal = {Journal of Organometallic Chemistry},
	volume = {693},
	number = {4},
	year = {2008},
	note = {<p>280EXTimes Cited:9Cited References Count:32</p>
},
	month = {Feb 15},
	pages = {769-775},
	abstract = {<p>A series of cobalt(II) compounds of the type [CoX2(alpha-diimine)] were synthesised by direct reaction of anhydrous CoCl2 or CoI2 and the corresponding alpha-diimine ligand, in CH2Cl2: [CoI2(o,o{\textquoteright},p-Me3C6H2-DAB)] ( 1), [ CoI2(o,o{\textquoteright}-(Pr2C6H3)-Pr-i-DAB)] ( 2), ( where Ar-DAB = 1,4-bis(aryl)-2,3-dimethyl-1,4-diaza-1,3-butadiene), and [CoCl2(o,o{\textquoteright},p-Me3C6H2- BIAN)] (3), [CoCl2(o,o{\textquoteright}- (Pr2C6H3)-Pr-i-BIAN)] (4), and [CoI2(o,o{\textquoteright}-(Pr2C6H3)-Pr-i-BIAN)] (5) (where Ar-BIAN = bis(aryl) acenaphthenequinonediimine). All compounds were characterised by elemental analyses, IR, mass spectrometry, and X-ray diffraction whenever possible. The crystal structures of compounds 2-4 showed, in all cases, distorted tetrahedral geometries about the Co, built by two halogen atoms and two nitrogen atoms of the alpha-diimine ligand. Compounds 3 and 4, as well as [ CoCl2(o,o{\textquoteright},p-Me3C6H2-DAB)] (1a), and [ CoCl2( o,o{\textquoteright}- (Pr2C6H3)-Pr-i- DAB)] (2a), were activated by methylaluminoxane (MAO) and tested as catalysts for ethylene polymerisation, showing low catalytic activities. Selected polyethylene ( PE) samples were characterised by H-1 and C-13 NMR and FT-IR spectroscopies, and by differential scanning calorimetry (DSC), revealing branching microstructures (2.5-5.5\%). (c) 2007 Elsevier B. V. All rights reserved.</p>
},
	keywords = {a-diimine ligands, bian ligands, bis(aryl)acenaphthenequinonediimine, catalysts, cobalt(ii) complexes, coordination strength, dft, ethylene, metal, olefins, oligomerization, polymerisation, x-ray diffraction},
	isbn = {0022-328X},
	url = {<Go to ISI>://000254409200022},
	author = {Rosa, V. and Carabineiro, S. A. and Aviles, T. and Gomes, P. T. and Welter, R. and Campos, J. M. and Ribeiro, M. R.}
}
