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

Handle URI:
http://hdl.handle.net/10754/563880
Title:
Ethylene polymerization by PN3-type pincer chromium(III) complexes
Authors:
Gong, Dirong; Liu, Wen; Chen, Tao; Chen, Zhongren; Huang, Kuo-Wei ( 0000-0003-1900-2658 )
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.
KAUST Department:
KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division; Chemical Science Program; HCL
Publisher:
Elsevier BV
Journal:
Journal of Molecular Catalysis A: Chemical
Issue Date:
Dec-2014
DOI:
10.1016/j.molcata.2014.08.005
Type:
Article
ISSN:
13811169
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.
Is Supplemented By:
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:http://hdl.handle.net/10754/624671
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorGong, Dirongen
dc.contributor.authorLiu, Wenen
dc.contributor.authorChen, Taoen
dc.contributor.authorChen, Zhongrenen
dc.contributor.authorHuang, Kuo-Weien
dc.date.accessioned2015-08-03T12:18:07Zen
dc.date.available2015-08-03T12:18:07Zen
dc.date.issued2014-12en
dc.identifier.issn13811169en
dc.identifier.doi10.1016/j.molcata.2014.08.005en
dc.identifier.urihttp://hdl.handle.net/10754/563880en
dc.description.abstractChromium (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.en
dc.description.sponsorshipWe 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.en
dc.publisherElsevier BVen
dc.subjectChromium catalysten
dc.subjectEthylene polymerizationen
dc.subjectPincer liganden
dc.subjectPolyethyleneen
dc.titleEthylene polymerization by PN3-type pincer chromium(III) complexesen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical Science Programen
dc.contributor.departmentHCLen
dc.identifier.journalJournal of Molecular Catalysis A: Chemicalen
dc.contributor.institutionDepartment of Polymer Science and Engineering, School of Material Sciences and Chemical Engineering, Ningbo University, Ningbo 315211, Chinaen
dc.contributor.institutionLaboratory of Advanced Textile Materials and Manufacturing Technology, Natl. Base for International Cooperation in Science and Technology of Textiles and Daily Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, Chinaen
kaust.authorGong, Dirongen
kaust.authorHuang, Kuo-Weien
dc.relation.isSupplementedByGong, 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/ccxy5ggen
dc.relation.isSupplementedByDOI:10.5517/ccxy5ggen
dc.relation.isSupplementedByHANDLE:http://hdl.handle.net/10754/624671en
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