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Silica‐Supported Pentamethylcyclopentadienyl Ytterbium(II) and Samarium(II) Sites: Ultrahigh Molecular Weight Polyethylene without Co‐Catalyst
Author(s) -
Allouche Florian,
Chan Ka Wing,
Fedorov Alexey,
Andersen Richard A.,
Copéret Christophe
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201800542
Subject(s) - samarium , catalysis , ethylene , ytterbium , polymerization , polyethylene , chemistry , cyclopentadienyl complex , alkyl , polymer chemistry , metal , inorganic chemistry , organic chemistry , materials science , polymer , optoelectronics , doping
Abstract 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.