Silica-supported Ti chloride tetrahydrofuranates, precursors of Ziegler-Natta catalysts

Kalaivani Seenivasan, Erik Gallo, Andrea Piovano, Jenny G. Vitillo, Anna Sommazzi, Silvia Bordiga, Carlo Lamberti, Pieter Glatzel, Elena Groppo

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

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 TiCl 3(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.

Original languageEnglish (US)
Pages (from-to)12706-12713
Number of pages8
JournalDalton Transactions
Volume42
Issue number35
DOIs
StatePublished - Sep 21 2013

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