IR study on the photochemistry and adsorption states of iron carbonyls adsorbed on alumina

Journal Article · Thu Oct 03 04:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100173a042· OSTI ID:7163222

Sato, Shinri; Ohmori, Tadayoshi ^[1]

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1. Inst. for Molecular Science, Myodaiji, Okazaki (Japan)

The behavior of iron carbonyls adsorbed on alumina has been studied in the dark and under UV illumination by FTIR spectroscopy. Photolysis products of adsorbed Fe(CO){sub 5} are affected by hydration of the surface as well as by their stability on alumina. On hydrated surfaces the photolysis leads to the formation of (HFe{sub 3}(CO){sub 11}){sup {minus}}, (HFe(CO){sub 4}){sup {minus}}, and Fe(CO){sub 4}, which can be thermally produced at a lower rate by base catalysis. The photo- and thermochemical formation of (HFe(CO){sub 4}){sup {minus}} requires stronger basic sites than that required for the formation of (HFe{sub 3}(CO){sub 11}){sup {minus}}. The photolysis of Fe(CO){sub 5} on dehydrated alumina results in predominant formation of Fe{sub 2}(CO){sub 9} with concomitant formation of a small amount of Fe{sub 3}(CO){sub 12}, though the latter is exclusively formed under similar conditions on silica. This is because Fe{sub 3}(CO){sub 12} undergoes a disproportionation reaction on dehydrated alumina. These photoproducts appear to be formed not at the outermost surface of alumina but inside the sample disk. The results are discussed with reference to those obtained for silica in terms of catalytic properties of oxide surfaces.

• OSTI ID: 7163222
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:20; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400500* -- Photochemistry
ABSORPTION SPECTROSCOPY
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBONYLS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
FOURIER ANALYSIS
HETEROGENEOUS CATALYSIS
HYDRATION
INFORMATION
INFRARED SPECTRA
IRON COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOLYSIS
RADIATIONS
SOLVATION
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ULTRAVIOLET RADIATION