Transition Metal Chemistry

, Volume 38, Issue 2, pp 119–127

Dioxygen activation in photooxidation of diphenylmethane by a dioxomolybdenum(VI) complex anchored covalently onto mesoporous titania

  • Nelson J. Castellanos
  • Fernando Martínez
  • Frédéric Lynen
  • Shyam Biswas
  • Pascal Van Der Voort
  • Henri Arzoumanian
Article

DOI: 10.1007/s11243-012-9668-2

Cite this article as:
Castellanos, N.J., Martínez, F., Lynen, F. et al. Transition Met Chem (2013) 38: 119. doi:10.1007/s11243-012-9668-2

Abstract

A dioxomolybdenum(VI) complex has been covalently anchored onto mesoporous titania by a silicon-assisted transesterification route. The grafting of the complex to the mesoporous structure was confirmed by diffuse reflectance infrared Fourier transform, Raman and UV–Vis spectroscopy and by nitrogen sorption experiments. The ability of the grafted complex to activate molecular oxygen (O2) has been evaluated in the photooxidation of diphenylmethane to produce benzophenone. The photooxidation of diphenylmethane was monitored continuously by in situ dispersive Raman spectroscopy. A scheme for the activation of molecular oxygen under very mild conditions is proposed. A comparison with the same complex anchored onto commercial titanium P-25 and silica gel revealed both the beneficial effect of the mesoporous structure and the existence of a synergistic effect between MoO/TiO2/O2/light entities, which promotes the photooxidation process under green chemistry conditions. Finally, the heterogeneous catalyst is sustainable; it can be recycled and reused without significant loss in activity or selectivity.

Supplementary material

11243_2012_9668_MOESM1_ESM.doc (1.6 mb)
Supplementary material 1 (DOC 1638 kb)

Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • Nelson J. Castellanos
    • 1
    • 2
    • 4
  • Fernando Martínez
    • 2
  • Frédéric Lynen
    • 3
  • Shyam Biswas
    • 4
  • Pascal Van Der Voort
    • 4
  • Henri Arzoumanian
    • 5
  1. 1.Facultad de Química Ambiental, Grupo de Investigaciones Ambientales para el desarrollo Sostenible-GIADSUniversidad Santo TomasSantanderColombia
  2. 2.Escuela de Química, Centro de Investigación en Catálisis-CICATUniversidad Industrial de SantanderSantanderColombia
  3. 3.Laboratory of Separation Sciences, Department of Organic ChemistryUniversity of GhentGhentBelgium
  4. 4.Department of Inorganic and Physical Chemistry, Centre for Ordered Materials, Organometallics and Catalysis-COMOCUniversity of GhentGhentBelgium
  5. 5.Chirosciences UMR CNRS 7313 Institut des Sciences Moléculaires de Marseille (iSm2)Aix-Marseille UniversitéMarseilleFrance