Direct evidence of adsorption induced Cr(II) mobility on the SiO(2) surface upon complexation by CO.

نویسندگان

  • Diego Gianolio
  • Elena Groppo
  • Jenny G Vitillo
  • Alessandro Damin
  • Silvia Bordiga
  • Adriano Zecchina
  • Carlo Lamberti
چکیده

In situ, temperature dependent, XAFS proved that Cr(II) grafted on SiO(2) is extracted from the surface upon CO adsorption at 100 K: DeltaR(Cr-O) = +0.08 A. CO adsorption evolves into two coverage dependent steps: (i) displacement of weak siloxane ligands (non-classical carbonyls); (ii) relaxation of R(Cr-O) surface bond, R(Cr-CO) optimization and transformation into classical carbonyls.

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عنوان ژورنال:
  • Chemical communications

دوره 46 6  شماره 

صفحات  -

تاریخ انتشار 2010