EPR Identification of Zr(III) Complexes Formed upon Interaction of (2-PhInd)2ZrCl2 and rac-Me2Si(1-Ind)2ZrCl2 with MAO and MMAO Full article
| Journal |
Macromolecular Chemistry and Physics
ISSN: 1022-1352 , E-ISSN: 1521-3935 |
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| Output data | Year: 2007, Volume: 208, Number: 11, Pages: 1168-1175 Pages count : 8 DOI: 10.1002/macp.200700066 | ||
| Tags | Deactivation, ESR/EPR, Metallocene catalysts, Methyl-aluminoxane, Zirconium(III) | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Foundation for Basic Research | 06-03-32700 |
Abstract:
Reactions of 1 and 2 with MAO and MMAO were monitored by EPR. It was found that MMAO is a stronger reducing agent than MAO. 1 is more prone to reduction than 2. The reduction of ZrIV to ZrIII seems to be the essential pathway of some zirconocene catalysts' deactivation. ZrIII species with the following proposed structures can be identified in the 1/MMAO system: (2-PhInd)2ZrIII(iBu), (2-PhInd)2ZrIII(µ-Cl)2AliBu2, (2-PhInd)2ZrIII(µ-Cl)(iBu)AliBu2, and [(2-PhInd)2ZrIII]+[Me-MAO]−. The degree of reduction of ZrIV species determined by EPR in the catalytic system 2/MMAO can be masked by the formation of diamagnetic ZrIII/ZrIII dimers. Addition of monomers to the 2/MAO system promotes reduction ot the zirconium species.
Cite:
Lyakin O.Y.
, Bryliakov K.P.
, Panchenko V.N.
, Semikolenova N.V.
, Zakharov V.A.
, Talsi E.P.
EPR Identification of Zr(III) Complexes Formed upon Interaction of (2-PhInd)2ZrCl2 and rac-Me2Si(1-Ind)2ZrCl2 with MAO and MMAO
Macromolecular Chemistry and Physics. 2007. V.208. N11. P.1168-1175. DOI: 10.1002/macp.200700066 WOS Scopus РИНЦ ANCAN OpenAlex
EPR Identification of Zr(III) Complexes Formed upon Interaction of (2-PhInd)2ZrCl2 and rac-Me2Si(1-Ind)2ZrCl2 with MAO and MMAO
Macromolecular Chemistry and Physics. 2007. V.208. N11. P.1168-1175. DOI: 10.1002/macp.200700066 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Feb 5, 2007 |
| Accepted: | Mar 21, 2007 |
| Published online: | May 29, 2007 |
| Published print: | Jun 4, 2007 |
Identifiers:
| Web of science: | WOS:000247305100002 |
| Scopus: | 2-s2.0-34547947251 |
| Elibrary: | 13553140 |
| Chemical Abstracts: | 2007:700237 |
| Chemical Abstracts (print): | 147:277687 |
| OpenAlex: | W2133993403 |