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    Ethylene polymerization by PN3-type pincer chromium(III) complexes

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    Type
    Article
    Authors
    Gong, Dirong
    Liu, Wen
    Chen, Tao
    Chen, Zhongren
    Huang, Kuo-Wei cc
    KAUST Department
    Chemical Science Program
    Homogeneous Catalysis Laboratory (HCL)
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Date
    2014-12
    Permanent link to this record
    http://hdl.handle.net/10754/563880
    
    Metadata
    Show full item record
    Abstract
    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.2014.08.005
    Sponsors
    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 BV
    Journal
    Journal of Molecular Catalysis A: Chemical
    DOI
    10.1016/j.molcata.2014.08.005
    Relations
    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
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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