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

Authors
  • Gianolio, Diego
  • Groppo, Elena
  • Vitillo, Jenny G
  • Damin, Alessandro
  • Bordiga, Silvia
  • Zecchina, Adriano
  • Lamberti, Carlo
Type
Published Article
Journal
Chemical Communications
Publisher
The Royal Society of Chemistry
Publication Date
Feb 14, 2010
Volume
46
Issue
6
Pages
976–978
Identifiers
DOI: 10.1039/b920681g
PMID: 20107669
Source
Medline
License
Unknown

Abstract

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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