Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 690, Issue 5, Pages 1233-1239Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2004.11.029
Keywords
iron complex; cobalt complex; catalyst; ethylene polymerization
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A series of 2,6-bis(imino)pyridyl iron(II) and cobalt(II) complexes [2,6-(ArN = CMe)(2)C5H3N]MCl2 (Ar = 2,6-i-Pr2C6H3, M = Fe: 3a, M = Cc: 4a; Ar = 2,4,6-i-Pr3C6H2, M = Fe: 3b, M = Co: 4b; Ar = 2,6-i-Pr-2-4-BrC6H2, M = Fe: 3c, M = Cc: 4c; Ar = 2,4-i-Pr-2-6-BrC6H2, M = Fe: 3d, M = Co: 4d) has been synthesized, characterized, and investigated as precatalysts for the polymerization of ethylene in the presence of modified methylaluminoxane (MMAO). The substituents of pyridinebisimine ligands and their positions located significantly influence catalyst activity and polymer property. It is found that the catalytic activities of the iron complexes/ MMAO systems are mainly dominated by electronical effect, while those of the cobalt complexes/MMAO systems are primarily controlled by hindering effect. (c) 2004 Elsevier B.V. All rights reserved.
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