Direct evidence of adsorption induced CrII mobility on the SiO2 surface upon complexation by CO

Diego Gianolio; Elena Groppo; Jenny G. Vitillo; Alessandro Damin; Silvia Bordiga; Adriano Zecchina; Carlo Lamberti

doi:10.1039/B920681G

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Direct evidence of adsorption induced Cr^II mobility on the SiO₂ surface upon complexation by CO†

Diego Gianolio,^a Elena Groppo,*^a Jenny G. Vitillo,^a Alessandro Damin,^a Silvia Bordiga,^a Adriano Zecchina^a and Carlo Lamberti^a

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* Corresponding authors

^a 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
E-mail: elena.groppo@unito.it
Fax: +390116707855
Tel: +390116708373

Abstract

In situ, temperature dependent, XAFS proved that Cr^II grafted on SiO₂ is extracted from the surface upon CO adsorption at 100 K: ΔR_Cr–O = +0.08 Å. 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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Supplementary files

EXAFS data collection and analysis, and IR and Raman setups PDF (314K)

Article information

DOI: https://doi.org/10.1039/B920681G
Article type: Communication
Submitted: 06 Oct 2009
Accepted: 19 Nov 2009
First published: 11 Dec 2009

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Chem. Commun., 2010,46, 976-978

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Direct evidence of adsorption induced Cr^II mobility on the SiO₂ surface upon complexation by CO

D. Gianolio, E. Groppo, J. G. Vitillo, A. Damin, S. Bordiga, A. Zecchina and C. Lamberti, Chem. Commun., 2010, 46, 976 DOI: 10.1039/B920681G

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