Rhodium dicarbonyl species on silica and alumina: Characterization with sup 13 C NMR

Journal Article · Thu Sep 07 00:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100355a038· OSTI ID:6986077

Thayer, A M; Duncan, T M ^[1]

---

1. AT and T Bell Labs., Murray Hill, NJ (USA)

The authors have obtained {sup 13} NMR spectra of several highly dispersed, low-loading Rh samples which are chiefly comprised of dicarbonyl species. In addition to the motionally averaged dicarbonyl species initially identified, the spectra reveal the presence of two other dicarbonyl species. One dicarbonyl type is characterized by rapid mutual exchange of the CO's whereas in the other type the CO's are constrained to appear rigid on the NMR time scale. These three dicarbonyl species are inherently unresolvable with vibrational and electron spectroscopies but yield three disparate NMR line shapes. It is shown that these new species resolve the inconsistencies in a previous model, and a modified method to obtain site distributions is described.

• OSTI ID: 6986077
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:18; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000 -- Chemistry
400200 -- Inorganic
Organic
& Physical Chemistry
ADSORPTION
ALUMINATES
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CARBONYLS
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL DATA
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
RHODIUM CARBIDES
RHODIUM COMPOUNDS
SORPTION
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS