Surface organometallic approach to the process of formation of bimetallic particles from bimetallic supported molecular clusters

L. Huang*, A. Choplin, J. M. Basset, V. Siriwardane, S. G. Shore, R. Mathieu

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

12 Scopus citations

Abstract

The reaction of the mixed hydrido-carbonyl clusters H2FeM3(CO)13 (M = Ru, Os) and HFeCo3(CO)12 with the surface of hydroxylated magnesia leads to the grafted anionic clusters [HFeM3CO)13]-, (M = Ru, Os) and [FeCo3(CO)12]-, the cation being an Mg2+ ion from the surface. The reactivity of the mixed anions at the surface of magnesia has been followed in vacuo, and in the presence of CO and H2, in order to understand the chemical processes which occur during the transformation of the mixed metal clusters into mixed metal particles. In vacuo, the anionic clusters [HFeM3(CO)13]- fragment into Fe2+ and [HM3(CO)11]- (M = Ru, Os), whereas [FeCo3(CO)12]- fragments to Fe2+ and [Co(CO)4]-. Under CO, the anionic cluster [HFeRu3(CO)13]- fragments to Fe(CO)5 and [HRu3(CO)11]- which further decomposes to ruthenium metal; the anionic cluster [HFeOs3(CO)13]- fragments to Fe(CO)5 and [HOs3(CO)11]- which produces the decacarbonyl cluster [Os10C(CO)24]-, which is extremely stable on the surface. The anionic cluster [FeCo3(CO)12]- fragments to Fe(CO)5 and [Co(CO)4]-, which is stabilized by surface cations. Under H2, the three mixed metal clusters decompose into mixed metal particles having the same composition as that of the starting cluster.

Original languageEnglish (US)
Pages (from-to)1-19
Number of pages19
JournalJournal of molecular catalysis
Volume56
Issue number1 -3 pt 2
DOIs
StatePublished - Jan 1 1989
Externally publishedYes
EventSixth International Symposium on Relations between Homogeneous and Heterogeneous Catalysis, Part 2 - Pisa, Italy
Duration: Sep 25 1989Sep 29 1989

ASJC Scopus subject areas

  • Engineering(all)

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