Ionic heterometallic complexes of potassium (ammonium) chlorides and with dibenzo-24-crown-8 in ethylene polymerizationстатья
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Аннотация:Ionic heterometallic complexes containing potassium and ammonium cations in the cavity of dibenzo-24-crown-8 and anion [TiCl6]- have been synthesized. The structure of these compounds was determined by X-ray diffraction analysis. In the presence of the Al/Mg activators - Et2AlCl/Bu2Mg or Et2AlCl/Me3Al/(4-tBuC6H4O)2Mg the complexes catalyze the polymerization of ethylene with activity up to 5320 kg PE/mol Ti h atm) with the formation of ultrahigh molecular weight polyethylene (UHMWPE) with molecular weights up to 4.5·106 Da. Ionic heterometallic complexes are superior in activity to neutral extra-cavity molecular complexes DB24C8TiCl4.