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Distinct methylalumoxane(MAO)-derived Me–MAO<sup>−</sup> anions in contact with a zirconocenium cation—a <sup>13</sup>C-NMR study

Distinct methylalumoxane(MAO)-derived Me–MAO− anions in contact with a zirconocenium cation—a 13C-NMR study

Type of Publication: Journal article
URI (citable link): http://nbn-resolving.de/urn:nbn:de:bsz:352-236734
Author: Babushkin, Dmitrii E.; Naundorf, Corinna; Brintzinger, Hans-Herbert
Year of publication: 2006
Published in: Dalton Transactions ; 2006, 38. - pp. 4539-4544. - ISSN 1477-9226. - eISSN 1477-9234
Pubmed ID: 17016564
DOI (citable link): https://dx.doi.org/10.1039/B611028M
Summary:
Zirconocenium cations of the type [(MeC5H4)2ZrMe]+, formed by excess methylalumoxane (MAO) from (MeC5H4)2ZrCl2 or (MeC5H4)2ZrMe2 with 13C-labelled ring ligands, are found to form ion pairs with two types of anions, Me–MAOA− and Me–MAOB−, which differ in their coordinative strengths: More strongly coherent ion pairs [(MeC5H4)2ZrMe+***Me–MAOB−] are converted to more easily separable ion pairs [(MeC5H4)2ZrMe+***Me–MAOA−] by a sufficient excess of MAO. These react with Al2Me6 to form outer-sphere ion pairs containing the cationic AlMe3 adduct [(MeC5H4)2Zr(µ-Me)2AlMe2]+; formation of the more easily separable ion pairs might be required also for polymerisation catalysis.
Subject (DDC): 540 Chemistry
Link to License: In Copyright

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BABUSHKIN, Dmitrii E., Corinna NAUNDORF, Hans-Herbert BRINTZINGER, 2006. Distinct methylalumoxane(MAO)-derived Me–MAO− anions in contact with a zirconocenium cation—a 13C-NMR study. In: Dalton Transactions(38), pp. 4539-4544. ISSN 1477-9226. eISSN 1477-9234. Available under: doi: 10.1039/B611028M

@article{Babushkin2006-10-14Disti-23673, title={Distinct methylalumoxane(MAO)-derived Me–MAO− anions in contact with a zirconocenium cation—a 13C-NMR study}, year={2006}, doi={10.1039/B611028M}, number={38}, issn={1477-9226}, journal={Dalton Transactions}, pages={4539--4544}, author={Babushkin, Dmitrii E. and Naundorf, Corinna and Brintzinger, Hans-Herbert} }

2013-07-24T19:04:08Z 2006-10-14 Zirconocenium cations of the type [(MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>ZrMe]<sup>+</sup>, formed by excess methylalumoxane (MAO) from (MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>ZrCl<sub>2</sub> or (MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>ZrMe<sub>2</sub> with <sup>13</sup>C-labelled ring ligands, are found to form ion pairs with two types of anions, Me–MAO<sub>A</sub><sup>−</sup> and Me–MAO<sub>B</sub><sup>−</sup>, which differ in their coordinative strengths: More strongly coherent ion pairs [(MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>ZrMe<sup>+</sup>***Me–MAO<sub>B</sub><sup>−</sup>] are converted to more easily separable ion pairs [(MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>ZrMe<sup>+</sup>***Me–MAO<sub>A</sub><sup>−</sup>] by a sufficient excess of MAO. These react with Al<sub>2</sub>Me<sub>6</sub> to form outer-sphere ion pairs containing the cationic AlMe<sub>3</sub> adduct [(MeC<sub>5</sub>H<sub>4</sub>)<sub>2</sub>Zr(µ-Me)<sub>2</sub>AlMe<sub>2</sub>]<sup>+</sup>; formation of the more easily separable ion pairs might be required also for polymerisation catalysis. Naundorf, Corinna Brintzinger, Hans-Herbert Brintzinger, Hans-Herbert eng Distinct methylalumoxane(MAO)-derived Me–MAO<sup>−</sup> anions in contact with a zirconocenium cation—a <sup>13</sup>C-NMR study Naundorf, Corinna Babushkin, Dmitrii E. terms-of-use 2013-07-24T19:04:08Z Babushkin, Dmitrii E. Dalton Transactions ; (2006), 38. - S. 4539-4544

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