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
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Macromolecular Chemistry and Physics
ISSN: 1022-1352 , E-ISSN: 1521-3935 |
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| 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 | ||
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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
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 |