Direct evidence of adsorption induced Cr(II) mobility on the SiO(2) surface upon complexation by CO.
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.
Gianolio
Diego
D
Department of Inorganic, Physical and Materials Chemistry, INSTM Centro di Riferimento and NIS Centre of Excellence, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy.
Groppo
Elena
E
Vitillo
Jenny G
JG
Damin
Alessandro
A
Bordiga
Silvia
S
Zecchina
Adriano
A
Lamberti
Carlo
C