Type of Publication: | Journal article |
URI (citable link): | http://nbn-resolving.de/urn:nbn:de:bsz:352-236741 |
Author: | Wieser, Ulrich; Schaper, Frank; Brintzinger, Hans-Herbert |
Year of publication: | 2006 |
Published in: | Macromolecular Symposia ; 236 (2006), 1. - pp. 63-68. - ISSN 1022-1360. - eISSN 1521-3900 |
DOI (citable link): | https://dx.doi.org/10.1002/masy.200690068 |
Summary: |
Reaction of Me2Si(Ind)2ZrCl2 with excess methylalumoxane (MAO) gives rise to ion pairs containing zirconocenium cations of the type [Me2Si(Ind)2ZrMe]+ in contact with two types of anions, MeMAOA− and MeMAOB−, which differ in their coordinative strengths: More strongly coherent contact-ion pairs [Me2Si(Ind)2 ZrMe+**MeMAOB−] are converted by a sufficiently high excess of MAO to more easily separable contact-ion pairs [Me2Si(Ind)2ZrMe+**MeMAOA−], which react with AlMe3 to form the outer-sphere ion pairs [Me2Si(Ind)2Zr(µ-Me)2AlMe2]+ MeMAOA−, and are likely to be required also for the formation of the olefin-containing reaction complexes responsible for catalytic activity.
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Subject (DDC): | 540 Chemistry |
Keywords: | Metallocene catalysts, methylalumoxane, polymerization catalysis, reaction intermediates, UV-vis spectroscopy |
Link to License: | In Copyright |
WIESER, Ulrich, Frank SCHAPER, Hans-Herbert BRINTZINGER, 2006. Methylalumoxane (MAO)-derived MeMAO− anions in zirconocene-based polymerization catalyst systems – a UV-Vis spectroscopic study. In: Macromolecular Symposia. 236(1), pp. 63-68. ISSN 1022-1360. eISSN 1521-3900. Available under: doi: 10.1002/masy.200690068
@article{Wieser2006Methy-23674, title={Methylalumoxane (MAO)-derived MeMAO− anions in zirconocene-based polymerization catalyst systems – a UV-Vis spectroscopic study}, year={2006}, doi={10.1002/masy.200690068}, number={1}, volume={236}, issn={1022-1360}, journal={Macromolecular Symposia}, pages={63--68}, author={Wieser, Ulrich and Schaper, Frank and Brintzinger, Hans-Herbert} }
Wieser_236741.pdf | 485 |