title: Bis(imino)diphenylamido rare-earth metal dialkyl complexes: synthesis, structure, and catalytic activity in living ring-opening ε-caprolactone polymerization and copolymerization with γ-butyrolactone.
abstract: Bis(imino)diphenylamido rare-earth metal dialkyl complexes [o-(2,6-(i)Pr(2)-C(6)H(3)-N=C-C(6)H(4))(2)-N]Ln(CH(2)SiMe(3))(2) (1: Ln = Sc; 2: Ln = Lu; 3: Ln = Y) have been synthesized in good yields and structurally characterized by elemental analysis, NMR spectroscopy, and single-crystal X-ray diffraction studies. They serve as highly efficient single-component catalysts both for the living ring-opening ε-caprolactone polymerization and random copolymerization with γ-butyrolactone, with the activity being dependent on the steric hindrance around the metal center, yielding high molecular weight PCLs or P(CL-co-BL)s with narrow molecular weight distributions.
authors.affiliation: Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, China.
authors.forename: Gaixia
authors.initials: G
authors.lastname: Du
authors.forename: Yanling
authors.initials: Y
authors.lastname: Wei
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Yuping
authors.initials: Y
authors.lastname: Dong
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Lin
authors.forename: Huan
authors.initials: H
authors.lastname: He
authors.forename: Shaowen
authors.initials: S
authors.lastname: Zhang
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Li
mesh_terms: D015107:4-Butyrolactone / Q000737:chemistry*; D002208:Caproates / Q000737:chemistry*; D002384:Catalysis; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D007783:Lactones / Q000737:chemistry*; D008674:Metals, Rare Earth / Q000737:chemistry*; D008968:Molecular Conformation; D058105:Polymerization
chemical_list: D002208:Caproates; D056831:Coordination Complexes; D007783:Lactones; D008674:Metals, Rare Earth; C121056:caprolactone; D015107:4-Butyrolactone