Osmium subcarbonyls on [gamma]-alumina: Characterization of the metal-support bonding by infrared, nuclear magnetic resonance, and x-ray absorption spectroscopies

Journal Article · Sat May 01 00:00:00 EDT 1993 · Langmuir; (United States)

DOI:https://doi.org/10.1021/la00029a022· OSTI ID:5845444

Deutsch, S E; Chang, J R; Gates, B C ^[1]

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1. Univ. of Delaware, Newark (United States)

[Os[sub 3](CO)[sub 12]] reacted with the surface of [gamma]-Al[sub 2]O[sub 3] to give a supported osmium carbonyl cluster, which was fragmented under He at 150[degrees]C to give osmium subcarbonyls. These surface species were characterized by infrared, [sup 13]C NMR, and extended x-ray absorption fine structure (EXAFS) spectroscopies and by x-ray absorption near edge spectroscopy (XANES). They are formulated as [Os(CO)[sub x][l brace]HOA[r brace][sub y][l brace]OA[r brace][sub z]], where the braces represent groups at the [gamma]-Al[sub 2]O[sub 3] surface and x is 2 or 3 and y + z = 6 [minus] x. When the osmium tricarbonyl (x = 3) was treated under vacuum at 300[degrees]C, it lost one CO ligand and gained one surface oxygen ligand. The surface species are both coordinatively saturated and characterized by an Os-O[sub support] bonding distance of 2.17 [angstrom]; in these respects, they are close analogues of organometallic compounds. 31 refs., 8 figs., 2 tabs.

• DOE Contract Number: FG02-87ER13790; FG05-89ER45384; AC02-76CH00016
• OSTI ID: 5845444
• Journal Information: Langmuir; (United States), Journal Name: Langmuir; (United States) Journal Issue: 5 Vol. 9:5; ISSN LANGD5; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBONYLS
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
COMPLEXES
INFRARED SPECTRA
NMR SPECTRA
OSMIUM COMPLEXES
OXIDES
OXYGEN COMPOUNDS
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENT COMPLEXES
X-RAY SPECTRA