ISSN:
1572-8862
Keywords:
Metal carbonyl clusters
;
SiO2-supported iridium
;
XPS
;
photoelectron spectroscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract The initial stage of Ir4(CO)12 physisorption on SiO2 from solutions and the subsequent modifications induced by heating under different atmospheres are discussed with the help of XPS results obtained on samples treatedin situ. Ir4(CO)12 is shown to physisorb as crystallites. A good dispersion of crystallites on SiO2 is obtainedvia heating at 373 K under Ar. Ir4(CO)12-supported clusters can be reduced to metal under mild conditions, with complete loss of ligands on controlled heating under Ar or H2. The final products of the process are metal clusters, which are obtained at different nuclearities, depending on the duration of the process. We present the first report on the obtainment of Ir on SiO2 at the same Ir4f7/2 binding energy (b.e.) of bulk Ir.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00702743
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