Publikation: ansa-metallocene derivatives XXXIII. 2-Dimethylamino-substituted bis-indenyl zirconium dichloride complexes with and without a dimethylsilyl bridge : syntheses, crystal structures and properties in propene polymerization catalysis
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Bis(2-N,N-dimethylamino-indenyl) zirconium dichloride, (2-(CH3)2N-C9H6)2ZrCl2, and dimethylsilyl-bridged bis(2-N,N-dimethylamino-indenyl) zirconium dichloride, (CH3)2Si(2-(CH3)2N-C9H5)2ZrCl2, were prepared by reaction of the corresponding ligand lithium salts with ZrCl4 in toluene. Diffractometric structure determinations reveal C2-symmetric complex geometries for both complexes. An increased electron density at the Zr center of the dimethylamino-substituted complexes is indicated by reduction potentials which are 0.3–0.4 V more negative than those of their unsubstituted analogs. When activated with methyl aluminoxane in toluene solution, (CH3)2Si(2-(CH3)2N-C9H5)2ZrCl2 catalyzes the polymerization of propene to polymers with a microstructure comparable with that of polymers produced with other Me2Si-bridged bis(indenyl)ZrCl2 complexes, but with a substantially increased fraction of i-propyl end groups derived from alkyl exchange between Zr-polymer and AlMe species.
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BARSTIES, Elke, Stefan SCHAIBLE, Marc-Heinrich PROSENC, Ursula RIEF, Werner RÖLL, Oliver WEYAND, Birgit DORER, Hans-Herbert BRINTZINGER, 1996. ansa-metallocene derivatives XXXIII. 2-Dimethylamino-substituted bis-indenyl zirconium dichloride complexes with and without a dimethylsilyl bridge : syntheses, crystal structures and properties in propene polymerization catalysis. In: Journal of Organometallic Chemistry. 1996, 520(1-2), pp. 63-68. ISSN 0022-328X. Available under: doi: 10.1016/0022-328X(96)06263-8BibTex
@article{Barsties1996ansam-23917, year={1996}, doi={10.1016/0022-328X(96)06263-8}, title={ansa-metallocene derivatives XXXIII. 2-Dimethylamino-substituted bis-indenyl zirconium dichloride complexes with and without a dimethylsilyl bridge : syntheses, crystal structures and properties in propene polymerization catalysis}, number={1-2}, volume={520}, issn={0022-328X}, journal={Journal of Organometallic Chemistry}, pages={63--68}, author={Barsties, Elke and Schaible, Stefan and Prosenc, Marc-Heinrich and Rief, Ursula and Röll, Werner and Weyand, Oliver and Dorer, Birgit and Brintzinger, Hans-Herbert} }
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