6-Arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)-iminopyridylmetal (Fe and Co) Complexes as Highly Active Precatalysts for Ethylene Polymerization: Influence of Metal and/or Substituents on the Active, Thermostable Performance of Their Complexes and Resultant Polyethylenes
A series of 6-arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)iminopyridines and their iron(II) and cobalt(II) complexes (<b>Fe1</b>–<b>Fe5</b>, <b>Co1</b>–<b>Co5</b>) were synthesized and routinely characterized as were <b>Co3</b> and <b&...
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MDPI AG
2020-09-01
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| Online Access: | https://www.mdpi.com/1420-3049/25/18/4244 |
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| author | Wenhua Lin Liping Zhang Jiahao Gao Qiuyue Zhang Yanping Ma Hua Liu Wen-Hua Sun |
| author_facet | Wenhua Lin Liping Zhang Jiahao Gao Qiuyue Zhang Yanping Ma Hua Liu Wen-Hua Sun |
| author_sort | Wenhua Lin |
| collection | DOAJ |
| description | A series of 6-arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)iminopyridines and their iron(II) and cobalt(II) complexes (<b>Fe1</b>–<b>Fe5</b>, <b>Co1</b>–<b>Co5</b>) were synthesized and routinely characterized as were <b>Co3</b> and <b>Co5</b> complexes, studied by single crystal X-ray crystallography, which individually displayed a distorted square pyramidal or trigonal bipyramid around a cobalt center. Upon treatment with either methyluminoxane (MAO) or modified methyluminoxane (MMAO), all complexes displayed high activities regarding ethylene polymerization even at an elevated temperature, enhancing the thermostability of the active species. In general, iron precatalysts showed higher activities than their cobalt analogs; for example, 10.9 × 10<sup>6</sup> g(PE) mol<sup>−1</sup> (Co) h<sup>−1</sup> by <b>Co4</b> and 17.0 × 10<sup>6</sup> g(PE) mol<sup>−1</sup> (Fe) h<sup>−1</sup> by <b>Fe4</b>. Bulkier substituents are favored for increasing the molecular weights of the resultant polyethylenes, such as 25.6 kg mol<sup>−1</sup> obtained by <b>Co3</b> and 297 kg mol<sup>−1</sup> obtained by <b>Fe3</b>. A narrow polydispersity of polyethylenes was observed by iron precatalysts activated by MMAO, indicating a single-site active species formed. |
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| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T16:18:32Z |
| publishDate | 2020-09-01 |
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| spelling | doaj.art-60db4272800d4ddf993c372be120c8272023-11-20T13:53:00ZengMDPI AGMolecules1420-30492020-09-012518424410.3390/molecules251842446-Arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)-iminopyridylmetal (Fe and Co) Complexes as Highly Active Precatalysts for Ethylene Polymerization: Influence of Metal and/or Substituents on the Active, Thermostable Performance of Their Complexes and Resultant PolyethylenesWenhua Lin0Liping Zhang1Jiahao Gao2Qiuyue Zhang3Yanping Ma4Hua Liu5Wen-Hua Sun6School of Textiles Science and Engineering, Jiangnan University, Wuxi 214122, ChinaSchool of Textiles Science and Engineering, Jiangnan University, Wuxi 214122, ChinaKey Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, ChinaA series of 6-arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)iminopyridines and their iron(II) and cobalt(II) complexes (<b>Fe1</b>–<b>Fe5</b>, <b>Co1</b>–<b>Co5</b>) were synthesized and routinely characterized as were <b>Co3</b> and <b>Co5</b> complexes, studied by single crystal X-ray crystallography, which individually displayed a distorted square pyramidal or trigonal bipyramid around a cobalt center. Upon treatment with either methyluminoxane (MAO) or modified methyluminoxane (MMAO), all complexes displayed high activities regarding ethylene polymerization even at an elevated temperature, enhancing the thermostability of the active species. In general, iron precatalysts showed higher activities than their cobalt analogs; for example, 10.9 × 10<sup>6</sup> g(PE) mol<sup>−1</sup> (Co) h<sup>−1</sup> by <b>Co4</b> and 17.0 × 10<sup>6</sup> g(PE) mol<sup>−1</sup> (Fe) h<sup>−1</sup> by <b>Fe4</b>. Bulkier substituents are favored for increasing the molecular weights of the resultant polyethylenes, such as 25.6 kg mol<sup>−1</sup> obtained by <b>Co3</b> and 297 kg mol<sup>−1</sup> obtained by <b>Fe3</b>. A narrow polydispersity of polyethylenes was observed by iron precatalysts activated by MMAO, indicating a single-site active species formed.https://www.mdpi.com/1420-3049/25/18/4244linear polyethylenescobalt precatalystiron precatalystthermostable and efficient catalysiscorrelation between structure and activity |
| spellingShingle | Wenhua Lin Liping Zhang Jiahao Gao Qiuyue Zhang Yanping Ma Hua Liu Wen-Hua Sun 6-Arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)-iminopyridylmetal (Fe and Co) Complexes as Highly Active Precatalysts for Ethylene Polymerization: Influence of Metal and/or Substituents on the Active, Thermostable Performance of Their Complexes and Resultant Polyethylenes Molecules linear polyethylenes cobalt precatalyst iron precatalyst thermostable and efficient catalysis correlation between structure and activity |
| title | 6-Arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)-iminopyridylmetal (Fe and Co) Complexes as Highly Active Precatalysts for Ethylene Polymerization: Influence of Metal and/or Substituents on the Active, Thermostable Performance of Their Complexes and Resultant Polyethylenes |
| title_full | 6-Arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)-iminopyridylmetal (Fe and Co) Complexes as Highly Active Precatalysts for Ethylene Polymerization: Influence of Metal and/or Substituents on the Active, Thermostable Performance of Their Complexes and Resultant Polyethylenes |
| title_fullStr | 6-Arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)-iminopyridylmetal (Fe and Co) Complexes as Highly Active Precatalysts for Ethylene Polymerization: Influence of Metal and/or Substituents on the Active, Thermostable Performance of Their Complexes and Resultant Polyethylenes |
| title_full_unstemmed | 6-Arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)-iminopyridylmetal (Fe and Co) Complexes as Highly Active Precatalysts for Ethylene Polymerization: Influence of Metal and/or Substituents on the Active, Thermostable Performance of Their Complexes and Resultant Polyethylenes |
| title_short | 6-Arylimino-2-(2-(1-phenylethyl)naphthalen-1-yl)-iminopyridylmetal (Fe and Co) Complexes as Highly Active Precatalysts for Ethylene Polymerization: Influence of Metal and/or Substituents on the Active, Thermostable Performance of Their Complexes and Resultant Polyethylenes |
| title_sort | 6 arylimino 2 2 1 phenylethyl naphthalen 1 yl iminopyridylmetal fe and co complexes as highly active precatalysts for ethylene polymerization influence of metal and or substituents on the active thermostable performance of their complexes and resultant polyethylenes |
| topic | linear polyethylenes cobalt precatalyst iron precatalyst thermostable and efficient catalysis correlation between structure and activity |
| url | https://www.mdpi.com/1420-3049/25/18/4244 |
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