Naphthyridine cyclopentadienyl chromium complexes as single-site catalysts for the formation of ultrahigh molecular weight polyethylene
Cyclopentadienyl ligands functionalized with a 1,5-naphthyridine donor have been used for the formation of chromium(III) half-sandwich complexes. In addition to standard analytical characterization, the complexes have been investigated by paramagnetic 1H NMR spectroscopy combined with DFT calculatio...
Gespeichert in:
| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
October 25, 2012
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| In: |
Organometallics
Year: 2012, Jahrgang: 31, Heft: 21, Pages: 7368-7374 |
| ISSN: | 1520-6041 |
| DOI: | 10.1021/om300582j |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1021/om300582j Verlag, Volltext: https://doi.org/10.1021/om300582j 
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| Verfasserangaben: | David Sieb, Robert W. Baker, Hubert Wadepohl, and Markus Enders |
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| 520 | |a Cyclopentadienyl ligands functionalized with a 1,5-naphthyridine donor have been used for the formation of chromium(III) half-sandwich complexes. In addition to standard analytical characterization, the complexes have been investigated by paramagnetic 1H NMR spectroscopy combined with DFT calculations. After activation, highly active single-site catalysts are obtained that lead to the formation of ultrahigh molecular weight polyethylene (UHMW-PE). Evaluation of polymer formation after different polymerization times at low temperature shows that the number of active centers is low at the beginning, but increases with polymerization time. | ||
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