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Polymerization of Ethylene Catalyzed by Iron Complex Bearing 2,6-Bis(imine)pyridyl Ligand: 1H and 2H NMR Monitoring of Ferrous Species Formed via Catalyst Activation with AlMe3, MAO, AlMe3/B(C6F5)3 and AlMe3/CPh3(C6F5)4 Full article

Journal Macromolecular Chemistry and Physics
ISSN: 1022-1352 , E-ISSN: 1521-3935
Output data Year: 2001, Volume: 202, Number: 10, Pages: 2046-2051 Pages count : 6 DOI: 10.1002/1521-3935(20010601)202:10<2046::AID-MACP2046>3.0.CO;2-3
Tags 2,6 bis(imine)pyridyl ligand; 2,6 bis[1 (2,6 dimethylphenylimino)ethyl]pyridine iron chloride; aluminum derivative; ethylene; iron complex; ligand; polyethylene; pyridine derivative; unclassified drug
Authors Talsi Evgenii P. 1 , Babushkin Dmitrii E. 1 , Semikolenova Nina V. 1 , Zudin Vladimir N. 1 , Panchenko Valentina N. 1 , Zakharov Vladimir A. 1
Affiliations
1 Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva 5, 630090 Novosibirsk, Russian Federation

Abstract: 1H and 2H NMR spectroscopic monitoring of ferrous species formed via interaction of 2,6-bis[1-(2,6-dimethylphenylimino)ethyl]pyridineiron(II) chloride (1) with AlMe3, MAO, AlMe3/B(C6F5)3 and AlMe3/CPh3 (C6F5)4 is reported. At interaction of 1 with MAO in toluene solution, the new stable heterodinuclear neutral complexes with proposed structures LFe(II)(Cl)(μ-Me)2AlMe2 and LFe(II)(Me)(μ-Me)2AlMe2 are formed (L is initial tridentate ligand). Complex LFe(II)(Cl)(μ-Me)2AlMe2 predominates at low Al/Fe ratios (less than 50), while LFe(II)(Me)(μ-Me)2AlMe2 at high Al/Fe ratios (more than 500). Complex assigned to LFe(II)(Me)(μ-Me)2AlMe2 can be prepared via interaction of 1 with AlMe3. Activation of LFe(II)(Me)(μ-Me)2AlMe2 by B(C6F5)3 and CPh3B(C6F5)4 gives rise to formation of new complexes with proposed structures [LFe(μ-Me)2AlMe2]+[MeB(C6F5)3]– and [LFe(μ-Me)2AlMe2]+ [B(C6F5)4]–. Unexpectedly, the activity at ethylene polymerization was even higher for 1/AlMe3 than for 1/MAO catalytic system. The co-catalytic activity of MAO towards 1 dramatically decreased with the diminishing of AlMe3 content in the composition of MAO. Activity of the catalyst 1/AlMe3 and the molecular structure of polyethylene produced do not change noticeably at the addition of B(C6F5)3 to 1/AlMe3.These data allow to suggest, that active species of 1/AlMe3 and 1/MAO systems are neutral methylated ferrous complexes but not cationic intermediates. Probably, complex LFe(II)(Me)(μ-Me)2 AlMe2 is the closest precursor of these active species.
Cite: Talsi E.P. , Babushkin D.E. , Semikolenova N.V. , Zudin V.N. , Panchenko V.N. , Zakharov V.A.
Polymerization of Ethylene Catalyzed by Iron Complex Bearing 2,6-Bis(imine)pyridyl Ligand: 1H and 2H NMR Monitoring of Ferrous Species Formed via Catalyst Activation with AlMe3, MAO, AlMe3/B(C6F5)3 and AlMe3/CPh3(C6F5)4
Macromolecular Chemistry and Physics. 2001. V.202. N10. P.2046-2051. DOI: 10.1002/1521-3935(20010601)202:10<2046::AID-MACP2046>3.0.CO;2-3 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
Submitted: Aug 21, 2000
Accepted: Jan 23, 2001
Published online: Jul 4, 2001
Published print: Jul 27, 2001
Identifiers:
Web of science: WOS:000170262300008
Scopus: 2-s2.0-0035958990
Elibrary: 13371766
Chemical Abstracts: 2001:584639
Chemical Abstracts (print): 135:304175
OpenAlex: W2026492406
Citing:
DB Citing
Web of science 87
Scopus 84
Elibrary 93
OpenAlex 92
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