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

[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 fi...

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Bibliographic Details
Published in:Langmuir 1993-05, Vol.9:5 (5)
Main Authors: Deutsch, S.E., Chang, J.R., Gates, B.C.
Format: Article
Language:English
Subjects:
400102 - Chemical & Spectral Procedures
400201 - Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBONYLS
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
COMPLEXES
INFRARED SPECTRA
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
NMR SPECTRA
OSMIUM COMPLEXES
OXIDES
OXYGEN COMPOUNDS
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENT COMPLEXES
X-RAY SPECTRA
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Description
Summary:[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.
ISSN:0743-7463
1520-5827
DOI:10.1021/la00029a022