Homo-polymerization of 1-hexene catalysed by OˆNˆN (Salicylaldimine)iron(III) pre-catalysts to branched poly(1-hexene)

Margaret Yankey; Collins Obuah; James Darkwa

doi:10.3390/catal6030047

Homo-polymerization of 1-hexene catalysed by OˆNˆN (Salicylaldimine)iron(III) pre-catalysts to branched poly(1-hexene)

Margaret Yankey, Collins Obuah, James Darkwa

University of Johannesburg

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Five new iron(III) 1-hexene polymerisation catalysts were prepared from the reactions of 2,4-di-tert-butyl-6-(2-(1H-imidazol-4-yl)ethylimino)methylphenol (L1), or 4-tert-butyl-6-(2-(1H- imidazol-4-yl)ethylimino)methylphenol (L2) or 2,4-di-tert-butyl-6-[(2-pyridin-2-yl-ethylimino)-methyl-phenol (L3) with anhydrous iron(II) halides to form [FeCl₂(L1)] (1), [FeBr₂(L1)] (2), [FeI₂(L1)] (3), [FeBr₂(L2)] (4) and [FeCl₂(L3)] (5). All the iron(III) complexes 1-5 were activated with EtAlCl2 to produce active catalysts for the polymerisation of 1-hexene to low molecular weight poly(1-hexene) (M_n = 1021-1084 Da) and very narrow polydispersity indices (1.19-1.24).¹H and¹³C{¹H} NMR analysis showed the polymers are branched with methyl, butyl and longer chain branches. The longer chain branches are dominant indicating that 2,1-insertion of monomer is favoured over 1,2-insertion in the polymerisation reaction.

Original language	English
Article number	47
Journal	Catalysts
Volume	6
Issue number	3
DOIs	https://doi.org/10.3390/catal6030047
Publication status	Published - 17 Mar 2016
Externally published	Yes

Keywords

(Salicylaldimine)iron(III) pre-catalysts
1-hexene polymerization
Branched low molecular weight poly(1-hexene)
Narrow polydispersity indices

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title = "Homo-polymerization of 1-hexene catalysed by OˆNˆN (Salicylaldimine)iron(III) pre-catalysts to branched poly(1-hexene)",

abstract = "Five new iron(III) 1-hexene polymerisation catalysts were prepared from the reactions of 2,4-di-tert-butyl-6-(2-(1H-imidazol-4-yl)ethylimino)methylphenol (L1), or 4-tert-butyl-6-(2-(1H- imidazol-4-yl)ethylimino)methylphenol (L2) or 2,4-di-tert-butyl-6-[(2-pyridin-2-yl-ethylimino)-methyl-phenol (L3) with anhydrous iron(II) halides to form [FeCl2(L1)] (1), [FeBr2(L1)] (2), [FeI2(L1)] (3), [FeBr2(L2)] (4) and [FeCl2(L3)] (5). All the iron(III) complexes 1-5 were activated with EtAlCl2 to produce active catalysts for the polymerisation of 1-hexene to low molecular weight poly(1-hexene) (Mn = 1021-1084 Da) and very narrow polydispersity indices (1.19-1.24).1H and13C{1H} NMR analysis showed the polymers are branched with methyl, butyl and longer chain branches. The longer chain branches are dominant indicating that 2,1-insertion of monomer is favoured over 1,2-insertion in the polymerisation reaction.",

keywords = "(Salicylaldimine)iron(III) pre-catalysts, 1-hexene polymerization, Branched low molecular weight poly(1-hexene), Narrow polydispersity indices",

author = "Margaret Yankey and Collins Obuah and James Darkwa",

note = "Publisher Copyright: {\textcopyright} 2016 by the authors; licensee MDPI, Basel, Switzerland.",

year = "2016",

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T1 - Homo-polymerization of 1-hexene catalysed by OˆNˆN (Salicylaldimine)iron(III) pre-catalysts to branched poly(1-hexene)

AU - Yankey, Margaret

AU - Obuah, Collins

AU - Darkwa, James

PY - 2016/3/17

Y1 - 2016/3/17

N2 - Five new iron(III) 1-hexene polymerisation catalysts were prepared from the reactions of 2,4-di-tert-butyl-6-(2-(1H-imidazol-4-yl)ethylimino)methylphenol (L1), or 4-tert-butyl-6-(2-(1H- imidazol-4-yl)ethylimino)methylphenol (L2) or 2,4-di-tert-butyl-6-[(2-pyridin-2-yl-ethylimino)-methyl-phenol (L3) with anhydrous iron(II) halides to form [FeCl2(L1)] (1), [FeBr2(L1)] (2), [FeI2(L1)] (3), [FeBr2(L2)] (4) and [FeCl2(L3)] (5). All the iron(III) complexes 1-5 were activated with EtAlCl2 to produce active catalysts for the polymerisation of 1-hexene to low molecular weight poly(1-hexene) (Mn = 1021-1084 Da) and very narrow polydispersity indices (1.19-1.24).1H and13C{1H} NMR analysis showed the polymers are branched with methyl, butyl and longer chain branches. The longer chain branches are dominant indicating that 2,1-insertion of monomer is favoured over 1,2-insertion in the polymerisation reaction.

AB - Five new iron(III) 1-hexene polymerisation catalysts were prepared from the reactions of 2,4-di-tert-butyl-6-(2-(1H-imidazol-4-yl)ethylimino)methylphenol (L1), or 4-tert-butyl-6-(2-(1H- imidazol-4-yl)ethylimino)methylphenol (L2) or 2,4-di-tert-butyl-6-[(2-pyridin-2-yl-ethylimino)-methyl-phenol (L3) with anhydrous iron(II) halides to form [FeCl2(L1)] (1), [FeBr2(L1)] (2), [FeI2(L1)] (3), [FeBr2(L2)] (4) and [FeCl2(L3)] (5). All the iron(III) complexes 1-5 were activated with EtAlCl2 to produce active catalysts for the polymerisation of 1-hexene to low molecular weight poly(1-hexene) (Mn = 1021-1084 Da) and very narrow polydispersity indices (1.19-1.24).1H and13C{1H} NMR analysis showed the polymers are branched with methyl, butyl and longer chain branches. The longer chain branches are dominant indicating that 2,1-insertion of monomer is favoured over 1,2-insertion in the polymerisation reaction.

KW - (Salicylaldimine)iron(III) pre-catalysts

KW - 1-hexene polymerization

KW - Branched low molecular weight poly(1-hexene)

KW - Narrow polydispersity indices

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SN - 2073-4344

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ER -

Homo-polymerization of 1-hexene catalysed by OˆNˆN (Salicylaldimine)iron(III) pre-catalysts to branched poly(1-hexene)

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