Evidence for Mixed-Ion Clusters in Metallocene Catalysts: Influence on Ligand Exchange Dynamics and Catalyst Activity

Alonso-Moreno, C, Lancaster, SJ, Zuccaccia, C, Macchioni, A and Bochmann, M (2007) Evidence for Mixed-Ion Clusters in Metallocene Catalysts: Influence on Ligand Exchange Dynamics and Catalyst Activity. Journal of the American Chemical Society, 129 (30). pp. 9282-9283.

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Abstract

Alkylzirconium ion pairs [L2Zr-CH2SiMe3+···B(C6F5)4-], as models of catalytic zirconium polymeryl species, form mixed-ion clusters [{LZrR+}n{CPh3+}m{X-}(n+m)], as shown by pulsed field-gradient spin-echo NMR measurements. Higher ion aggregation leads to enhanced rates of site epimerization. This rate enhancement is used to probe previously inaccessible kinetic barriers for the “chain swinging” process. The presence or absence of such a barrier has implications for catalytic activity and response to ionic activators.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Related URLs:
Depositing User: Rachel Smith
Date Deposited: 02 Nov 2010 17:48
Last Modified: 24 Jul 2019 15:21
URI: https://ueaeprints.uea.ac.uk/id/eprint/10539
DOI: 10.1021/ja072028h

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