129Xe NMR Spectroscopy of Metal Carbonyl Clusters and Metal Clusters in Zeolite NaY
| Autor: | Ghansham Panjabi, Tanja Pietrass, Kevin C. Ott, Bruce C. Gates, and William L. Earl, Andrea Labouriau, Bryan Enderle |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Journal of the American Chemical Society. 121:7674-7681 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/ja990532j |
| Popis: | [Ir4(CO)12] and [Ir6(CO)16] were synthesized in the pores of zeolite NaY by reductive carbonylation of sorbed [Ir(CO)2(acac)], and [Rh6(CO)16] was similarly synthesized from [Rh(CO)2(acac)]. The supported metal carbonyl clusters were decarbonylated to give supported clusters modeled on the basis of extended X-ray absorption fine structure spectra as Ir4, Ir6, and Rh6, respectively. The supported metal carbonyl clusters and the supported metal clusters formed by their decarbonylation were investigated by 129Xe NMR spectroscopy at temperatures in the range of 100−305 K. As the temperature increased, the chemical shift decreased. The curves representing the chemical shift as a function of temperature for xenon sorbed on the zeolite that contained clusters modeled as Ir4, Ir6, and Rh6 were all essentially the same and hardly different from that observed for the bare zeolite NaY. This comparison leads to the conclusion that xenon is less strongly adsorbed on the decarbonylated metal clusters than on the zeolit... |
| Databáze: | OpenAIRE |
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