ICCAS OpenIR
Accessible, Highly Active Single-Component beta-Ketiminato Neutral Nickel(II) Catalysts for Ethylene Polymerization
Song, Dong-Po1,2; Wu, Ji-Qian1; Ye, Wei-Ping1; Mu, Hong-Liang1,2; Li, Yue-Sheng1
2010-05-24
Source PublicationORGANOMETALLICS
ISSN0276-7333
Volume29Issue:10Pages:2306-2314
AbstractA series of novel neutral nickel complexes based on cyclic beta-ketiminato ligands, [(2,6-(i)Pr(2)C(6)H(3))N=CHC(6)H(8)O]Ni(Ph)(PPh(3)) (3b), [(2,6-iPr(2)C(5)H(3))N=CHC(n+3)H(2n+2)O(C(6)H(4))] Ni(Ph)(PPh(3)) (6a-c), and [(2,6-(i)Pr(2)C(6)H(3))N=CHC(n+3)H(2n+2)O(C(6)H(4))]Ni(CH(3))(Py) (7a-c: a, n = 0; b, n = 1; c, n = 2) have been synthesized and characterized. These conveniently accessible complexes proved to be highly active catalysts for ethylene polymerization without an activator. Under the optimized conditions, an activity of 71.4 kg of PE/((mol of Ni) h atm) was observed using 6c as a catalyst. Particularly, it is of great interest that a bulky substituent proximate to the oxygen atom of the beta-ketiminato complex is no longer a prerequisite to attain high catalytic efficiency, which is much different from the case for salicylaldiminato neutral nickel catalysts. This is effectively supported by the lower activation enthalpy changes of complexes 3b and 6a-c relative to values for the classic salicylaldiminato complexes. Moreover, for complexes 6a-c and 7a-c. the degree of conjugation between the phenylene ring and the corresponding nickel chelate of the complex can be tuned via changes in the ligand structure, which remarkably influence the molecular weights and the microstructures of the resulting polyethylenes. In comparison with the highly conjugated complexes 6a and 7a, complexes 6b,c and 7b,c, with a low degree of conjugation, produced polyethylenes with much higher molecular weights and lower branch contents. X-ray crystallographic analysis of 3b and 6a c provides detailed information about the differences among these structures, and various typical angles and bond distances produce evidence of the conjugation modulation effect.
DOI10.1021/om100075u
Indexed BySCI ; IC
Language英语
WOS IDWOS:000277597500013
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:37[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/69202
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, Grad Sch, Changchun Branch, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Song, Dong-Po,Wu, Ji-Qian,Ye, Wei-Ping,et al. Accessible, Highly Active Single-Component beta-Ketiminato Neutral Nickel(II) Catalysts for Ethylene Polymerization[J]. ORGANOMETALLICS,2010,29(10):2306-2314.
APA Song, Dong-Po,Wu, Ji-Qian,Ye, Wei-Ping,Mu, Hong-Liang,&Li, Yue-Sheng.(2010).Accessible, Highly Active Single-Component beta-Ketiminato Neutral Nickel(II) Catalysts for Ethylene Polymerization.ORGANOMETALLICS,29(10),2306-2314.
MLA Song, Dong-Po,et al."Accessible, Highly Active Single-Component beta-Ketiminato Neutral Nickel(II) Catalysts for Ethylene Polymerization".ORGANOMETALLICS 29.10(2010):2306-2314.
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