ICCAS OpenIR
Synthesis, structural characterization, and ethylene polymerization behavior of the vanadium(III) complexes bearing salicylaldiminato ligands
Wu, Ji-Qian1,2; Pan, Li1; Hu, Ning-Hai; Li, Yue-Sheng1
2008-08-11
Source PublicationORGANOMETALLICS
ISSN0276-7333
Volume27Issue:15Pages:3840-3848
AbstractVanadium(III) complexes bearing salicylaldiminato ligands (2a-k) [RN=CH(Ar0)]VCl2(THF)2 (Ar C61714, R = Ph, 2a; p-CF3Ph, 2b; p-CH3Ph, 2c; 2,6-Me2Ph, 2d; 2,6-iPr2Ph, 2e; cyclohexyl, 2f; Ar = C6H3tBu(2), R = Ph, 2g; 2,6-iPr2Ph, 2h; Ar = C6H2tBU2(2,4), R = Ph, 2i; 2,6-iPr2Ph, 2j; Ar = C6H2Br2, R = Ph, 2k) were prepared from VC13(THF)3 by treating with 1.0 equiv of (RN=CH)ArOH in tetrahydrofuran (THF) in the presence of excess triethylamine (TEA). The reaction Of VC13(THF)3 with 2.0 equiv of (RN=CH)ArOH in THF in the presence of excess TEA afforded vanadium(III) complexes bearing two salicylaldiminato ligands (3a-k), [RN=CH(Ar0)12VCl(THF), (Ar = C6H4, X = 1, R = Ph, 3a; p-CF3Ph, 3b; p-CH3Ph, 3c; 2,6-Me2Ph, 3d; 2,6-iPr2Ph, 3e; cyclohexyl, 3f; Ar = C6H3tBu(2), x = 1, R = Ph, 3g; x = 0, 2,6-iPr2Ph, 3h; Ar = C6H2tBU2(2,4), x = 1, R = Ph, 3i; 2,6-iPr2Ph, x = 0, 3j; Ar = C6H2Br2, X = 1, R = Ph, 3k). These complexes were characterized by FTIR and mass spectra as well as elemental analysis. Structures of complexes 2a, 2b, 2g, 2i, 2k, 3b, 3c, 3e, 3j, and 3k were further confirmed by X-ray crystallographic analysis. The complexes were investigated as catalysts for ethylene polymerization in the presence of Et2AlCl. Complexes 2a-k exhibited high catalytic activities (up to 22.3 kg PE/mmolv-h-bar) and afforded high molecular weight polymers (Mw > 100 kg/mol) with unimodal molecular weight distributions at room temperature, while displaying relatively low catalytic activities, and produced polymers with low molecular weight (Mw < 30 kg/mol) and broad molecular weight distributions at 70 'C. Complexes 3a-k were also effective catalyst precursors for ethylene polymerization. Even at 70 'C these complexes produced polyethylenes with unimodal distributions. These results indicated that the structural model of the salicylaldiminato vanadium(HI) complexes greatly affected the ethylene polymerization behaviors.
DOI10.1021/om800097b
Indexed BySCI ; IC
Language英语
WOS IDWOS:000258226100031
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:55[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/64818
Collection中国科学院化学研究所
Corresponding AuthorLi, Yue-Sheng
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Chinese Acad Sci, Changchun Branch, Grad Sch, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Wu, Ji-Qian,Pan, Li,Hu, Ning-Hai,et al. Synthesis, structural characterization, and ethylene polymerization behavior of the vanadium(III) complexes bearing salicylaldiminato ligands[J]. ORGANOMETALLICS,2008,27(15):3840-3848.
APA Wu, Ji-Qian,Pan, Li,Hu, Ning-Hai,&Li, Yue-Sheng.(2008).Synthesis, structural characterization, and ethylene polymerization behavior of the vanadium(III) complexes bearing salicylaldiminato ligands.ORGANOMETALLICS,27(15),3840-3848.
MLA Wu, Ji-Qian,et al."Synthesis, structural characterization, and ethylene polymerization behavior of the vanadium(III) complexes bearing salicylaldiminato ligands".ORGANOMETALLICS 27.15(2008):3840-3848.
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