Characterization of NaY zeolite-encaged tetrairidium clusters by infrared and X-ray absorption spectroscopies
- Univ. of Delaware, Newark, DE (United States) Univ. of California, Davis, CA (United States)
- Univ. of Delaware, Newark, DE (United States)
[Ir(CO)[sub 2](acac)] in the pores of NaY zeolite was treated in CO and converted into [Ir[sub 4](CO)[sub 12]]. The zeolite-encaged [Ir[sub 4](CO)[sub 12]] was characterized by infrared and extended X-ray absorption fine structure spectroscopies, with the data indicating an average Ir-Ir coordination number of 2.6 and an average Ir-Ir distance of 2.69 [angstrom], in agreement, within the experimental error, with the published crystallographic data for solid [Ir[sub 4](CO)[sub 12]]. Structurally simple zeolite-encaged iridium clusters were made by decarbonylation of the [Ir[sub 4](CO)[sub 12]] at 325[degree]C in flowing He followed by H[sub 2]. The decarbonylated clusters had an average Ir-Ir coordination number of 3.4 and a bond distance of 2.70 [angstrom], consistent with the inference that the tetrahedral framework structure of [Ir[sub 4](CO)[sub 12]] had been retained after decarbonylation; thus, the cluster is represented as tetrahedral Ir[sub 4]. Infrared spectra showed that [Ir[sub 4](CO)[sub 12]] was re-formed when the sample was treated in CO at 60[degree]C. 63 refs., 6 figs., 3 tabs.
- DOE Contract Number:
- FG05-89ER45384; AC02-76CH00016
- OSTI ID:
- 5576442
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:41; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CRYSTALLOGRAPHY
DATA
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
HELIUM
HYDROGEN
INFORMATION
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IRIDIUM COMPOUNDS
MATERIALS
MINERALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RARE GASES
REFRACTORY METAL COMPOUNDS
SILICATE MINERALS
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTROSCOPY
ZEOLITES