The synthesis is described of dissymmetric alkylidene bridged dinuclear metallocene complexes of titanium, zirconium and hafnium and some of the corresponding mononuclear reference complexes. The influence of structural parameters on the polymerization behaviour of the MAO activated complexes is systematically investigated for homogeneous ethylene polymerization. The dinuclear catalysts show higher polymerization activities than a mixture consisting of analogous mononuclear reference catalysts. The polyethylenes obtained from dinuclear complexes have higher polydispersities than those that were produced with mononuclear complexes.
ZusammenfassungDie Synthese von dissymmetrischen, alkylidenverbr€ uckten Metallocenzweikernkomplexen der Metalle Titan, Zirconium und Hafnium sowie von einkernigen Referenzkomplexen wird beschrieben. Der Einfluss von Strukturparametern auf das Polymerisationsverhalten der mit MAO aktivierten Komplexe in der homogenen Ethylenpolymerisation wird systematisch untersucht. Die dinuklearen Katalysatoren zeigen h€ ohere Ethylenpolymerisationsaktivit€ aten als eine Mischung der entsprechenden einkernigen Referenzkatalysatoren. Die von den Zweikernkomplexen erhaltenen Polymere weisen h€ ohere Polydispersit€ aten auf als die der Einkernkomplexe.
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