Synthesis and Structure of Group 4 Symmetric Amidinate Complexes and Their Reactivity in the Polymerization of α-Olefins

Autor:	Boris Tumanskii, Linda J. W. Shimon, Naveen V. Kulkarni, Moris S. Eisen, Mark Botoshansky, Tatyana Elkin
Rok vydání:	2013
Předmět:	Steric effects chemistry.chemical_classification Ethylene Chemistry Organic Chemistry Polymer Photochemistry Chloride Catalysis Inorganic Chemistry Amidine chemistry.chemical_compound Polymerization Polymer chemistry medicine Reactivity (chemistry) Physical and Theoretical Chemistry medicine.drug
Zdroj:	Organometallics. 32:6337-6352
ISSN:	1520-6041 0276-7333
DOI:	10.1021/om4006998
Popis:	The steric properties of various nitrogen substituents on amidines were tuned in order to obtain group 4 mono- and bis(amidinate) dimethylamido or chloride complexes. The amidinate dimethylamido and chloride complexes were prepared, and their solid-state as well as their solution-state structures were studied. After the activation by MAO, these complexes were tested in the polymerization of propylene and ethylene. A noticeable influence of the amidine carbon and nitrogen substituents on the activity of the catalyst and properties of the obtained polymer was observed. Further, a plausible mechanism for the ethylene polymerization process is presented taking into account a combination of ESR-C60 and MALDI-TOF experiments, shedding light on the nature of the catalytic species.
Databáze:	OpenAIRE
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