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XPS characterization of SiO2-supported iridium producedin situ from Ir4(CO)12

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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.

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Authors and Affiliations

  1. Dipartimento di Chimica, Università di Roma “La Sapienza,”, P.le Aldo Moro 5, 00185, Roma, Italy

    R. Zanoni

  2. Dipartimento di Chimica Inorganica e Metallorganica and Centro CNR, Università di Milano, via G. Venezian 21, 20133, Milano, Italy

    R. Psaro, C. Dossi, L. Garlaschelli, R. Della Pergola & D. Roberto

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  1. R. Zanoni
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  2. R. Psaro
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  3. C. Dossi
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  4. L. Garlaschelli
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  5. R. Della Pergola
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  6. D. Roberto
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Zanoni, R., Psaro, R., Dossi, C. et al. XPS characterization of SiO2-supported iridium producedin situ from Ir4(CO)12 . J Clust Sci 1, 241–247 (1990). https://doi.org/10.1007/BF00702743

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  • DOI: https://doi.org/10.1007/BF00702743

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