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Issue 35, 2013
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Thermal restructuring of silica-grafted –CrO2Cl and –VOCl2 species

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Abstract

The volatile molecular precursors CrO2Cl2 and VOCl3 were grafted to thermally dehydrated silica in order to obtain site-isolated, monopodal [triple bond, length as m-dash]SiO–MOxCly−1 species (M = V, Cr). Thermal restructuring under dynamic vacuum was investigated up to 450 °C with different spectroscopic techniques (viz., NMR, UV-Vis, IR, Raman and XPS). During this thermal restructuring, VOCl3 or CrO2Cl2 is partially eliminated from the surface, whilst the remaining surface species become multiply bound to the silica surface. This restructuring increases both the chemical and thermal stability of these materials, and has significant consequences for their performance as heterogeneous catalysts.

Graphical abstract: Thermal restructuring of silica-grafted –CrO2Cl and –VOCl2 species

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Publication details

The article was received on 28 Mar 2013, accepted on 17 May 2013 and first published on 11 Jun 2013


Article type: Paper
DOI: 10.1039/C3DT50843A
Citation: Dalton Trans., 2013,42, 12725-12732
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    Thermal restructuring of silica-grafted –CrO2Cl and –VOCl2 species

    P. Mania, S. Conrad, R. Verel, C. Hammond and I. Hermans, Dalton Trans., 2013, 42, 12725
    DOI: 10.1039/C3DT50843A

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