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Redox-switchable α-diimine palladium catalysts for control of polyethylene topology

Authors
  • Mundil, R
  • Wilson, LE
  • Schaarschmidt, D
  • Císařová, I
  • Merna, J
  • Long, NJ
Publication Date
Jun 28, 2019
Source
UPCommons. Portal del coneixement obert de la UPC
Keywords
Language
English
License
Unknown
External links

Abstract

A series of palladium complexes bearing ferrocene substituted α-diimine ligands was synthesized and investigated for ethene polymerization at different conditions to modulate the extent of “chain-walking” mechanism and regulate branching and topology of resulting polyethylenes. All ferrocene substituted complexes catalyzed living/controlled ethene polymerization. The ability of ferrocene substituted palladium complexes to provide polyethylenes with dendritic topology was proved by measuring their Mark-Houwink plots. In-situ chemical oxidation of ferrocene moieties via silver triflate was used to affect the catalyst electronic structure and support the “chain-walking” mechanism. Oxidation of palladium catalyst led to its destabilization while the catalytic activity of newly formed sites was substantially increased. It was demonstrated that catalyst oxidation is a powerful tool to regulate the topology of resulting polyethylenes.

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