, Volume 34, Issue 1-2, pp 65-73

Vapour phase deposition and thermal decarbonylation of Re2(CO)10 on gamma-alumina: infrared studies

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Abstract

Dirheniumdecacarbonyl vacuum sublimed onto mesoporous γ-alumina forms Lewis type adducts where an axial CO group is coordinated to an A13+ ion at the metal oxide surface, as revealed by IR spectroscopy. Vacuum heating of the surface adduct at 773 K brings about decarbonylation, with intermediate formation of a surface-bound mononuclear tricarbonyl which was completely decarbonylated on prolonged heating at the same temperature. The resulting material strongly chemisorbs CO to yield mainly a surface-bound pentacarbonyl species. This suggests that the supported metal remains primarily in a zero-valent and well dispersed state.