ICCAS OpenIR
Thiophene-NPN Ligand Supported Rare-Earth Metal Bis(alkyl) Complexes. Synthesis and Catalysis toward Highly trans-1,4 Selective Polymerization of Butadiene
Wang, Dun1,2; Li, Shihui1,2; Liu, Xinli1; Gao, Wei1,3; Cui, Dongmei1
2008-12-22
Source PublicationORGANOMETALLICS
ISSN0276-7333
Volume27Issue:24Pages:6531-6538
AbstractA series of new rare-earth metal bis(alkyl) complexes [L(1-3)Ln(CH(2)SiMe(3))(2)(THF)(n)] (L(1) = MeC(4)H(2)SCH(2)NC(6)H(4)(Ph)(2)P=NC(6)H(2)Me(3)-2,4,6: Ln = Sc, n = 1 (1a); Ln = Lu, n = 1 (1b); L(2) = MeC(4)H(2)SCH(2)NC(6)H(4)(Ph)(2)P=NC(6)H(3)Et(2)-2,6: Ln = Sc, n = 1 (2a); Ln = Lu, n = 1 (2b); Ln = Y, n = 1 (2c); L(3) = MeC(4)H(2)SCH(2)NC(6)H(4)(Ph)(2)P=NC(6)H(3)(i)Pr(2)-2,6: Ln = Sc, n = 0 (3a)) and L(4)Sc(CH(2)SiMe(3))(2()THF) (4a) (L(4) = C(6)H(5)CH(2)NC(6)H(4)(Ph)(2)P=NC(6)H(3)Et(2)-2,6) have been prepared by reaction of rare-earth metal tris(alkyl)s with the corresponding HL(1-4) ligands via alkane elimination. Complexes 1a, 1b, 2a-2c, and 4a are monomeric with a coordinating THF molecule. Each metal ion is coordinated by a NPN ligand, two trans-located atkyl groups, and a THF molecule, forming a distorted trigonal-bipyramidal geometry. Complex 3a is THF-free, adopting a distorted tetrahedron geometry. In combination with AlR(3) and borate, these complexes have shown medium activity and good trans-1,4 selectivity for the polymerization of butadiene. The resultant polymer has moderate molecular weight (M(n) = 10 000- 18 000) with narrow molecular weight distribution (M(w)/M(n) < 1.6) and trans-1,4 regularity varying from 49.2% up to 91.3%. The catalyst performances are strongly dependent on the ortho substituent of the N-aryl ring and the presence of the thiophene moiety of the ligands and the type of aluminum alkyls and the lanthanide metal used. The scandium complex 2a displays the highest trans-1,4 selectivity.
DOI10.1021/om800660j
Indexed BySCI ; IC
Language英语
WOS IDWOS:000261510000023
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:46[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/64198
Collection中国科学院化学研究所
Corresponding AuthorCui, Dongmei
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, Beijing 100039, Peoples R China
3.Jilin Univ, Dept Chem, Changchun 130023, Peoples R China
Recommended Citation
GB/T 7714
Wang, Dun,Li, Shihui,Liu, Xinli,et al. Thiophene-NPN Ligand Supported Rare-Earth Metal Bis(alkyl) Complexes. Synthesis and Catalysis toward Highly trans-1,4 Selective Polymerization of Butadiene[J]. ORGANOMETALLICS,2008,27(24):6531-6538.
APA Wang, Dun,Li, Shihui,Liu, Xinli,Gao, Wei,&Cui, Dongmei.(2008).Thiophene-NPN Ligand Supported Rare-Earth Metal Bis(alkyl) Complexes. Synthesis and Catalysis toward Highly trans-1,4 Selective Polymerization of Butadiene.ORGANOMETALLICS,27(24),6531-6538.
MLA Wang, Dun,et al."Thiophene-NPN Ligand Supported Rare-Earth Metal Bis(alkyl) Complexes. Synthesis and Catalysis toward Highly trans-1,4 Selective Polymerization of Butadiene".ORGANOMETALLICS 27.24(2008):6531-6538.
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