Ethylene polymerization by PN3-type pincer chromium(III) complexes
Type
ArticleKAUST Department
Chemical Science ProgramHomogeneous Catalysis Laboratory (HCL)
KAUST Catalysis Center (KCC)
Physical Science and Engineering (PSE) Division
Date
2014-12Permanent link to this record
http://hdl.handle.net/10754/563880
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Chromium (III) complexes, Cr1, [2,6-(tBu2PNH) 2C5H4N]CrCl3; Cr2, [2,6-(Ph 2PNH)2C5H4N]CrCl3; Cr3, [2-(tBu2PNH)C5H4N]CrCl3 THF; Cr4, [6-(tBu2PNH)C5H4N-2- CH2NEt2]CrCl3; Cr5, [6-(tBu 2PNH)C5H4N-2-C3H2N 2]CrCl3; Cr6, [6-(tBu2PNH)C 5H4N-2-(3,5-Me2)C3H 2N2]CrCl3; Cr7, [6-(tBu 2PNH)C5H4N-2-(3,5-iPr 2)C3H2N2]CrCl3; Cr8, [6-(tBu2PNH)C5H4N-2-(3,5-Ph 2)C3H2N2]CrCl3, bearing a family of neutral PN3-type pincer ligands have been prepared. The molecular structure of Cr2 was further elucidated by the X-ray crystallographic analysis, showing an octahedral geometry. Treatment of these complexes with MAO or alkylaluminum led to catalysts with moderate activities (about 105 g (PE)/Cr(mol) h) for ethylene polymerization, affording exclusively linear low molecular weight solid PE without any detectable oligomers. Among Cr1-Cr8, the highest activity was achieved for Cr1/MAO at room temperature with production of PE with highest molecular weight, indicating that replacement of both tBu groups in Cr1 with Ph groups, or one PtBu2 with the N (imine) arm, resulted in a lower catalytic activity and lower M w. © 2014 Elsevier B.V.Citation
Gong, D., Liu, W., Chen, T., Chen, Z.-R., & Huang, K.-W. (2014). Ethylene polymerization by PN3-type pincer chromium(III) complexes. Journal of Molecular Catalysis A: Chemical, 395, 100–107. doi:10.1016/j.molcata.2014.08.005Sponsors
We are grateful for the generous financial support from King Abdullah University of Science and Technology, the Natural Science Foundation of China (Grant Nos. 21304050 and 21302170), the Natural Science Foundation of Ningbo (Grant No. 2014A610109), K. C. Wong Magna Fund and Start-up Fund in Ningbo University.Publisher
Elsevier BVRelations
Is Supplemented By:- [Dataset]
Gong, D., Liu, W., Chen, T., Chen, Z.-R., & Huang, K.-W. (2015). CCDC 862186: Experimental Crystal Structure Determination [Data set]. Cambridge Crystallographic Data Centre. https://doi.org/10.5517/ccxy5gg. DOI: 10.5517/ccxy5gg HANDLE: 10754/624671
ae974a485f413a2113503eed53cd6c53
10.1016/j.molcata.2014.08.005