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Unexpected reactions between Ziegler-Natta catalyst components and structural characterization of resulting intermediates.
Autorzy
Rok wydania
2016
Czasopismo
Numer woluminu
55
Strony
4636-4642
DOI
10.1021/acs.inorgchem.6b00489
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
In this work, we investigated precursors and procatalysts with well-defined crystal structures and morphologies in Ziegler-Natta systems to improve our understanding of the nature of the active metal sites. Molecular cluster precursors such as [Mg4Ti3(μ6-O)(μ3-OH)3(μ-OEt)9(OEt)3(EtOH)3Cl3], [Mg4Ti3(μ6-O)(μ3-OH)(μ3-OEt)2(μ-OEt)9(OEt)3(EtOH)3Cl3], and [Mg6Ti4(μ6-O)2(μ3-OH)4(μ-OEt)14(OEt)4(EtOH)2Cl2] were prepared via simple elimination of the cyclopentadienyl ring from Cp2TiCl2as CpH in the presence of magnesium metal and ethanol. Titanocene dichloride acts as both a source of titanium and a magnesium-chlorinating agent. The resulting novel complexes were characterized using single-crystal X-ray diffraction. In these compounds, Ti(OEt)4molecules are grafted onto Mg4and Mg6ethoxide cubane-like surfaces; this strongly affects the procatalyst morphology, which is transferred to the polymer. Mg4(OR)8units act as carriers for the AlR3co-catalyst, resulting in return of alkyl functions to the Ti center.
Adres publiczny
http://dx.doi.org/10.1021/acs.inorgchem.6b00489
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