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Enhancing Ethylene Polymerization of NNN-Cobalt(II) Precatalysts Adorned with a Fluoro-substituent
[Image: see text] Unsymmetrical 2-(1-(2,4-dibenzhydryl-6-fluorophenylimino)ethyl)-6-(1-alkylphenyl-imino)ethyl)pyridine compounds (Ar = 2,6-Me(2)C(6)H(3) in L1; 2,6-Et(2)C(6)H(3) in L2; 2,6-(i)Pr(2)C(6)H(3) in L3; 2,4,6-Me(3)C(6)H(2) in L4; 2,6-Et(2)-4-Me-C(6)H(2) in L5) were prepared and characteri...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7893795/ https://www.ncbi.nlm.nih.gov/pubmed/33623851 http://dx.doi.org/10.1021/acsomega.0c05916 |
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author | Bariashir, Chantsalnyam Zhang, Randi Vignesh, Arumugam Ma, Yanping Liang, Tongling Sun, Wen-Hua |
author_facet | Bariashir, Chantsalnyam Zhang, Randi Vignesh, Arumugam Ma, Yanping Liang, Tongling Sun, Wen-Hua |
author_sort | Bariashir, Chantsalnyam |
collection | PubMed |
description | [Image: see text] Unsymmetrical 2-(1-(2,4-dibenzhydryl-6-fluorophenylimino)ethyl)-6-(1-alkylphenyl-imino)ethyl)pyridine compounds (Ar = 2,6-Me(2)C(6)H(3) in L1; 2,6-Et(2)C(6)H(3) in L2; 2,6-(i)Pr(2)C(6)H(3) in L3; 2,4,6-Me(3)C(6)H(2) in L4; 2,6-Et(2)-4-Me-C(6)H(2) in L5) were prepared and characterized. The treatment of CoCl(2) with the compounds L1–L5 afforded the corresponding cobalt complexes Co1–Co5 in excellent yields. The molecular structures of Co3 and Co4 were determined by single-crystal X-ray diffraction, revealing the distorted-square-pyramidal geometry with three nitrogen atoms and two chlorine atoms around the cobalt center. Compared with previous bis(imino)pyridylcobalt analogues, all of the cobalt precatalysts displayed exceptionally higher activities toward ethylene polymerization with 1.32 × 10(7) g (PE) mol(–1) (Co) h(–1) at 60 °C in the presence of a co-catalyst MAO or MMAO. These cobalt catalysts produced highly linear polyethylene (PE) waxes with vinyl end groups and low molecular weight (M(w) up to 8.23 kg mol(–1)) along with a relatively lower melting point (all-round T(m)s < 128 °C). The narrow dispersity of resultant polyethylenes indicated the single-site active species of the catalytic system. |
format | Online Article Text |
id | pubmed-7893795 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-78937952021-02-22 Enhancing Ethylene Polymerization of NNN-Cobalt(II) Precatalysts Adorned with a Fluoro-substituent Bariashir, Chantsalnyam Zhang, Randi Vignesh, Arumugam Ma, Yanping Liang, Tongling Sun, Wen-Hua ACS Omega [Image: see text] Unsymmetrical 2-(1-(2,4-dibenzhydryl-6-fluorophenylimino)ethyl)-6-(1-alkylphenyl-imino)ethyl)pyridine compounds (Ar = 2,6-Me(2)C(6)H(3) in L1; 2,6-Et(2)C(6)H(3) in L2; 2,6-(i)Pr(2)C(6)H(3) in L3; 2,4,6-Me(3)C(6)H(2) in L4; 2,6-Et(2)-4-Me-C(6)H(2) in L5) were prepared and characterized. The treatment of CoCl(2) with the compounds L1–L5 afforded the corresponding cobalt complexes Co1–Co5 in excellent yields. The molecular structures of Co3 and Co4 were determined by single-crystal X-ray diffraction, revealing the distorted-square-pyramidal geometry with three nitrogen atoms and two chlorine atoms around the cobalt center. Compared with previous bis(imino)pyridylcobalt analogues, all of the cobalt precatalysts displayed exceptionally higher activities toward ethylene polymerization with 1.32 × 10(7) g (PE) mol(–1) (Co) h(–1) at 60 °C in the presence of a co-catalyst MAO or MMAO. These cobalt catalysts produced highly linear polyethylene (PE) waxes with vinyl end groups and low molecular weight (M(w) up to 8.23 kg mol(–1)) along with a relatively lower melting point (all-round T(m)s < 128 °C). The narrow dispersity of resultant polyethylenes indicated the single-site active species of the catalytic system. American Chemical Society 2021-02-03 /pmc/articles/PMC7893795/ /pubmed/33623851 http://dx.doi.org/10.1021/acsomega.0c05916 Text en © 2021 The Authors. Published by American Chemical Society This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License (http://pubs.acs.org/page/policy/authorchoice_ccbyncnd_termsofuse.html) , which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes. |
spellingShingle | Bariashir, Chantsalnyam Zhang, Randi Vignesh, Arumugam Ma, Yanping Liang, Tongling Sun, Wen-Hua Enhancing Ethylene Polymerization of NNN-Cobalt(II) Precatalysts Adorned with a Fluoro-substituent |
title | Enhancing Ethylene Polymerization of NNN-Cobalt(II)
Precatalysts Adorned with a Fluoro-substituent |
title_full | Enhancing Ethylene Polymerization of NNN-Cobalt(II)
Precatalysts Adorned with a Fluoro-substituent |
title_fullStr | Enhancing Ethylene Polymerization of NNN-Cobalt(II)
Precatalysts Adorned with a Fluoro-substituent |
title_full_unstemmed | Enhancing Ethylene Polymerization of NNN-Cobalt(II)
Precatalysts Adorned with a Fluoro-substituent |
title_short | Enhancing Ethylene Polymerization of NNN-Cobalt(II)
Precatalysts Adorned with a Fluoro-substituent |
title_sort | enhancing ethylene polymerization of nnn-cobalt(ii)
precatalysts adorned with a fluoro-substituent |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7893795/ https://www.ncbi.nlm.nih.gov/pubmed/33623851 http://dx.doi.org/10.1021/acsomega.0c05916 |
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