A surface site as polydentate ligand of a metal complex: Density functional studies of rhenium subcarbonyls supported on magnesium oxide
- Technische Universitaet Muenchen, Garching (Germany). Lehrstuhl fuer Theoretische Chemie
Notwithstanding the importance of supported organometallic species as industrial catalysts, most are nonuniform mixtures, with only a few being well-characterized at the atomic level. Rhenium subcarbonyls on MgO, in contrast, consist of nearly uniform surface species and are among the best-studied organometallic complexes on oxides. EXAFS and infrared spectra showed that decomposition of the precursors [HRe(CO){sub 5}], [H{sub 3}Re{sub 3}(CO){sub 12}], and [Re{sub 2}(CO){sub 10}] on MgO powder results in fragments, assigned as Re(CO){sub 3}{sup n+}, coordinated to surface ligands. The concept of a surface site as a polydentate ligand evokes the remarkable circumstance in which the adsorbate-substrate bonds are as strong as metal-ligand bonds in common transition metal complexes, as shown by the present investigation.
- Sponsoring Organization:
- Alexander von Humboldt-Stiftung, Bonn (Germany); USDOE, Washington, DC (United States); Deutsche Forschungsgemeinschaft, Bonn (Germany)
- OSTI ID:
- 684317
- Journal Information:
- Journal of the American Chemical Society, Vol. 121, Issue 18; Other Information: PBD: 12 May 1999
- Country of Publication:
- United States
- Language:
- English
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