Structures of paramagnetic VIV amido complexes grafted onto metal oxide surfaces: Model systems for heterogeneous vanadium catalysts

Stefan Grasser, Carmen Haeßner, Klaus Köhler*, Frédéric Lefebvre, Jean-Marie Maurice Basset

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Well defined vanadium(IV) surface complexes were prepared via reaction of tetrakis(dimethylamido)-vanadium(IV), V[N(CH3)2]4, with protons of surface hydroxyl groups of three different, mainly non-porous oxides SiO2, Al2O3, and TiO2. The grafting reaction was performed either from pentane solution or from the gaseous phase under inert conditions. The density and number of hydroxyl groups were adjusted by thermal pre-treatment of the oxides in vacuo. Chemical analysis (V, N) provided information about the chemical composition of the vanadium surface species after grafting onto the oxides. The coordination sphere and redox properties of the mononuclear paramagnetic vanadium(IV) surface complexes were examined by electron paramagnetic resonance (EPR). After exposure to air vanadium(V) species could be identified by 51V-solid-state-NMR. Ligand exchange reactions were investigated by in-situ infrared spectroscopy after the immobilization reaction.

Original languageEnglish (US)
Pages (from-to)1906-1911
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume5
Issue number9
DOIs
StatePublished - May 1 2003

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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