Ancillary Ligands Impact Branching Microstructure in Late-Transition-Metal Polymerization Catalysis

Philip Kenyon, Laura Falivene, Lucia Caporaso, Stefan Mecking

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The influence of the labile ligand on the rate of β-hydride elimination (BHE) for salicylaldiminato Ni(II) complexes is shown using a series of precatalysts which differ only in the labile ligand but produce polyethylenes with a range of molecular weights (Mn = 466 to 100 kg mol-1), degrees of branching (1.7 to 7.3 branches/1000 C), and melting temperatures (from 132 to 123 °C) under the same conditions. The use of a weakly coordinating solvent (diethyl ether) was able to suppress this increase in BHE. DFT studies on a related salicylaldiminato Ni(II) complex show that BHE can feasibly occur following recombination of the labile ligand with the catalyst.
Original languageEnglish (US)
Pages (from-to)11552-11556
Number of pages5
JournalACS Catalysis
Volume9
Issue number12
DOIs
StatePublished - Nov 18 2019

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