Asymmetric bis(formamidinate) group 4 complexes: Synthesis, structure and their reactivity in the polymerization of α-olefins.

Naveen V. Kulkarni, Tatyana Elkin, Boris Tumaniskii, Mark Botoshansky, Linda J.W. Shimon, Moris S. Eisen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

A series of asymmetric formamidine ligands bearing different substituents with various steric and electronic properties on the nitrogen of the N-C-N motif were synthesized. Group 4 bis(formamidinate) dimethylamido, chloride, and benzyl complexes were studied using these asymmetric ligands and their solid-state structures and their behavior in solution were determined. These complexes were activated with MAO (methylalumoxane) or a combination of cocatalysts and tested in the polymerization of ethylene and propylene. A noticeable influence of the formamidine nitrogen substituents on the activity of the catalyst and properties of the obtained polymers was observed. Further, a plausible mechanism for the polymerization of propylene is presented derived from a combination of ESR-C60 and MALDI-TOF trapping experiments which shed light on the nature of the active catalytic species.

Original languageEnglish
Pages (from-to)3119-3136
Number of pages18
JournalOrganometallics
Volume33
Issue number12
DOIs
StatePublished - 23 Jun 2014
Externally publishedYes

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