Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-11-14

Journal: ORGANOMETALLICS

Included Journals: EI、SCIE、Scopus

Volume: 30

Issue: 21

Page Number: 5687-5694

ISSN: 0276-7333

Abstract: The N-heterocyclic carbene ligated scandium trialkyl complexes [{2,6-C(6)H(3)R(2)NCH}(2)CSc(CH(2)SiMe(3))(3)] (R = Me (1); R = 'Pr (2)) were synthesized by the reaction of 1 equiv of [Sc(CH(2)SiMe(3))(3)(THF)(2)] with the corresponding ligand [{2,6-C(6)H(3)R(2)NCH}(2)C]. Their molecular structures have been established by single-crystal X-ray diffraction. Upon activation with 2 equiv of [Ph(3)C][B(C(6)P(5))(4)], complexes 1 and 2 exhibited high activities up to 2520 (kg of polymer) (mol of Sc)(-1) h(-1) for 1-hexene homopolymerization, affording polymers with moderate molecular weight (18-46 kg mol(-1)) at room temperature. The use of a low reaction temperature of -30 degrees C resulted in high molecular weight (up to 631 kg mol(-1)). The catalyst systems based on complex 1 or 2 also showed excellent activities for 1-octene or 1-decene polymerization. Moreover, in the presence of 2 equiv of [Ph(3)C][B(C(6)F(5))4], complex 1 proved to be an excellent catalyst for copolymerization of 1-hexene (H) with 1,5-hexadiene (HD) to give random atactic H/HD copolymers with a wide range of HD contents (26.6-98.6 mol %), a previously unreported copolymer.