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Indexed by:期刊论文

Date of Publication:2011-11-14

Journal:ORGANOMETALLICS

Included Journals:Scopus、SCIE、EI

Volume:30

Issue:21

Page Number:5687-5694

ISSN No.: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.