The reaction of the mixed hydrido carbonyl H 2 FeM 3 (CO) 13 (M = Ru, Os) and HFeCo 3 (CO) 12 with the surface of partially hydroxylated magnesia has been studied in situ by IR spectroscopy, evolution of gases, and extraction of the adsorbed complexes. At room temperature, H 2 FeM 3 (CO) 13 (M = Ru, Os) and HFeCo 3 (CO) 12 are deprotonated at the surface of magnesia to give the anions [HFeM 3 (CO) 13 ] - (M = Ru, Os) and [FeCo 3 (CO) 12 ] - with virtually no disproportionation to other cluster species. The anions [HFeM 3 (CO) 13 ] - (M = Ru, Os) were also synthesized by proton abstraction by KOH and by KH. It is suggested that on the surface of the magnesia the deprotonation occurs via surface OH groups. From IR spectra apparently there is no tight ion pair between the anions on the surface and the Lewis centers which is in contrast with that which is observed for [HFe 3 (CO) 11 ] - (M = Fe). A mechanistic explanation is proposed. Thermal decomposition of the surface-bound anions has been studied.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry