期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 13, 页码 3431-3434出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201800542
关键词
catalysis; electron transfer; ethylene polymerization; lanthanocenes; surface chemistry
资金
- Marie Curie fellowship (FP7-PEOPLE-ITN) [317127]
- SNF [200021L_157146]
- Holcim Stiftung for a habilitation fellowship
- Swiss National Science Foundation (SNF) [200021L_157146] Funding Source: Swiss National Science Foundation (SNF)
Designing highly active supported ethylene polymerization catalysts that do not require a co-catalyst to generate electrophilic metal alkyl species is still a challenge despite its industrial relevance. Described herein is the synthesis and characterization of well-defined silica-supported cyclopentadienyl Ln(II) sites (Ln=Yb and Sm) of general formula [(SiO)LnCp*]. These well-defined surface species are highly activite towards ethylene polymerization in the absence of added co-catalyst. Initiation is proposed to occur by single electron transfer.
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