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Novel zirconocene hydride complexes in homogeneous and in SiO 2 -supported olefin-polymerization catalysts modified with diisobutylaluminum hydride or triisobutylaluminum

Novel zirconocene hydride complexes in homogeneous and in SiO 2 -supported olefin-polymerization catalysts modified with diisobutylaluminum hydride or triisobutylaluminum

Type of Publication: Journal article
URI (citable link): http://nbn-resolving.de/urn:nbn:de:bsz:352-236669
Author: Babushkin, Dmitrii E.; Panchenko, Valentina N.; Timofeeva, Maria N.; Zakharov, Vladimir A.; Brintzinger, Hans-Herbert
Year of publication: 2008
Published in: Macromolecular Chemistry and Physics ; 209 (2008), 12. - pp. 1210-1219. - ISSN 1022-1352. - eISSN 1521-3935
DOI (citable link): https://dx.doi.org/10.1002/macp.200800084
Summary:
Reactive species in SiO2-supported, zirconocene-based olefin-polymerization catalysts have been characterized by comparison of their UV-vis spectra with those of related, NMR-spectroscopically identified catalyst species in homogeneous solution. Neutral zirconocene dihydride complexes are found to arise in hydrocarbon solutions as well as on SiO2 supports when catalyst systems that contain rac-Me2Si(ind)2ZrCl2 and methylaluminoxane (MAO) are modified by addition of diisobutylaluminum hydride or triisobutylaluminum. These complexes, tentatively formulated as adducts with Lewis-acidic alkylaluminum species AlR2X, rac-Me2Si(ind)2ZrH2 · {nAlR2X}, are reconverted into the initial reactive zirconocene cations upon addition of isobutene to these reaction systems.
Subject (DDC): 540 Chemistry
Keywords: MAO activation, metallocene catalysts, olefin polymerization, polyolefins, SiO2 support
Link to License: In Copyright

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BABUSHKIN, Dmitrii E., Valentina N. PANCHENKO, Maria N. TIMOFEEVA, Vladimir A. ZAKHAROV, Hans-Herbert BRINTZINGER, 2008. Novel zirconocene hydride complexes in homogeneous and in SiO 2 -supported olefin-polymerization catalysts modified with diisobutylaluminum hydride or triisobutylaluminum. In: Macromolecular Chemistry and Physics. 209(12), pp. 1210-1219. ISSN 1022-1352. eISSN 1521-3935. Available under: doi: 10.1002/macp.200800084

@article{Babushkin2008Novel-23666, title={Novel zirconocene hydride complexes in homogeneous and in SiO 2 -supported olefin-polymerization catalysts modified with diisobutylaluminum hydride or triisobutylaluminum}, year={2008}, doi={10.1002/macp.200800084}, number={12}, volume={209}, issn={1022-1352}, journal={Macromolecular Chemistry and Physics}, pages={1210--1219}, author={Babushkin, Dmitrii E. and Panchenko, Valentina N. and Timofeeva, Maria N. and Zakharov, Vladimir A. and Brintzinger, Hans-Herbert} }

2013-07-24T12:26:23Z Zakharov, Vladimir A. Panchenko, Valentina N. 2008 Timofeeva, Maria N. Novel zirconocene hydride complexes in homogeneous and in SiO 2 -supported olefin-polymerization catalysts modified with diisobutylaluminum hydride or triisobutylaluminum terms-of-use Babushkin, Dmitrii E. eng Macromolecular Chemistry and Physics ; 209 (2008), 12. - S. 1210-1219 Zakharov, Vladimir A. Panchenko, Valentina N. 2013-07-24T12:26:23Z Brintzinger, Hans-Herbert Babushkin, Dmitrii E. Timofeeva, Maria N. Reactive species in SiO<sub>2</sub>-supported, zirconocene-based olefin-polymerization catalysts have been characterized by comparison of their UV-vis spectra with those of related, NMR-spectroscopically identified catalyst species in homogeneous solution. Neutral zirconocene dihydride complexes are found to arise in hydrocarbon solutions as well as on SiO<sub>2</sub> supports when catalyst systems that contain rac-Me<sub>2</sub>Si(ind)<sub>2</sub>ZrCl<sub>2</sub> and methylaluminoxane (MAO) are modified by addition of diisobutylaluminum hydride or triisobutylaluminum. These complexes, tentatively formulated as adducts with Lewis-acidic alkylaluminum species AlR2X, rac-Me<sub>2</sub>Si(ind)<sub>2</sub>ZrH<sub>2</sub> · {nAlR2X}, are reconverted into the initial reactive zirconocene cations upon addition of isobutene to these reaction systems. Brintzinger, Hans-Herbert

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