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Issue 35, 2013
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Silica-supported Ti chloride tetrahydrofuranates, precursors of Ziegler–Natta catalysts

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Abstract

The structural and electronic properties of silica-supported titanium chloride tetrahydrofuranates samples, obtained by impregnating a polymer-grade dehydroxylated silica with TiCl4(thf)2 and TiCl3(thf)3 complexes, precursors of Ziegler–Natta catalysts, are investigated by means of FT-IR, XAS, XES and diffuse reflectance UV-Vis spectroscopy, coupled with DFT calculations. The properties of the two silica-supported samples are very similar, irrespective of the starting precursor. In both cases, most of the chlorine ligands originally surrounding the Ti sites are substituted by oxygen ligands upon grafting on silica. As a consequence, the electronic properties of silica-supported Ti sites are largely different from those of the corresponding precursors, and in both cases most of the grafted Ti sites have a formal oxidation state of +4. The whole set of experimental data provide evidence that mono-nuclear Ti species are mainly present at the silica surface.

Graphical abstract: Silica-supported Ti chloride tetrahydrofuranates, precursors of Ziegler–Natta catalysts

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Publication details

The article was received on 05 Mar 2013, accepted on 08 May 2013 and first published on 09 May 2013


Article type: Paper
DOI: 10.1039/C3DT50603G
Citation: Dalton Trans., 2013,42, 12706-12713
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    Silica-supported Ti chloride tetrahydrofuranates, precursors of Ziegler–Natta catalysts

    K. Seenivasan, E. Gallo, A. Piovano, J. G. Vitillo, A. Sommazzi, S. Bordiga, C. Lamberti, P. Glatzel and E. Groppo, Dalton Trans., 2013, 42, 12706
    DOI: 10.1039/C3DT50603G

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