An EPR Study of the V(IV) Species Formed Upon Activation of a Vanadyl Phenoxyimine Polymerization Catalyst with AlR3 and AlR2Cl (R = Me, Et)

Soshnikov, Igor E., Semikolenova, Nina V., Bryliakov, Konstantin P., Shubin, Alexander A., Zakharov, Vladimir A., Redshaw, Carl and Talsi, Evgenii P. (2009) An EPR Study of the V(IV) Species Formed Upon Activation of a Vanadyl Phenoxyimine Polymerization Catalyst with AlR3 and AlR2Cl (R = Me, Et). Macromolecular Chemistry and Physics, 210 (7). pp. 542-548. ISSN 1022-1352

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Abstract

Vanadium(IV) complexes formed in the systems L2VIVO/AlR3, L2VIVO/AlR3/ETA, L2VIVO/AlR2Cl, and L2VIVO/AlR2Cl/ETA, where L is a phenoxyimine ligand (Scheme 1), R = Me or Et, and ETA is ethyltrichloroacetate, were monitored by EPR. It was shown, that at 20 °C, V(IV) complexes with proposed structures (L′)VIV(O)(R)(AlR3) are formed in the systems L2VIVO/AlR3 and L2VIVO/AlR3/ETA, whereas complexes with proposed structures (L′)VIV(O)(R)(AlR2Cl) are formed in the systems L2VIVO/AlR2Cl and L2VIVO/AlR2Cl/ETA (L′ is the modified initial ligand). The systems L2VIVO/AlR3/ETA are inert towards polymerization of ethylene, whereas the systems L2VIVO/AlR2Cl/ETA are moderately active in this reaction. The polymerization activity of the systems L2VIVO/AlR2Cl/ETA correlates with the concentration of V(IV) species present in the reaction solution. V(IV) complexes of the type (L′)VIV(O)(R)(AlR2Cl) can be precursors of the active species of polymerization.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Related URLs:
Depositing User: Rachel Smith
Date Deposited: 29 Mar 2011 09:27
Last Modified: 21 Apr 2020 17:46
URI: https://ueaeprints.uea.ac.uk/id/eprint/27180
DOI: 10.1002/macp.200800556

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