The dixenon(1+) cation: formation in the condensed phases and characterization by ESR, UV-visible, and Raman spectroscopy
| Autor: | Richard C. Fowler, Dean R. Brown, Lawrence Stein, James R. Norris, Anthony J. Downs, Alan R. Minihan, Martin J. Clegg |
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| Rok vydání: | 1992 |
| Předmět: |
Absorption spectroscopy
Analytical chemistry Antimony pentafluoride chemistry.chemical_element Resonance (chemistry) Action (physics) law.invention Inorganic Chemistry chemistry.chemical_compound symbols.namesake Xenon chemistry law symbols Physical chemistry Physical and Theoretical Chemistry Electron paramagnetic resonance Spectroscopy Raman spectroscopy |
| Zdroj: | Inorganic Chemistry. 31:5041-5052 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/ic00050a023 |
| Popis: | The redox chemistry of the couple formed by XeF[sup +] and elemental xenon gives rise to a green intermediate. This is formed, for example, from XeF[sup +]Sb[sub 2]F[sub 11][sup [minus]] in antimony pentafluoride solution, irreversibly under the action of various reducing agents (e.g. H[sub 2]O, Pb, Hg, SO[sub 2], PF[sub 3], or SbF[sub 3]) or reversibly under the action of xenon gas, and while an overpressure of xenon is maintained, it is long-lived at ambient temperatures. The product has been characterized by a combination of ESR, UV-visible, and Raman spectroscopies, enrichment in [sup 136]Xe or [sup 129]Xe playing a crucial role in establishing that the carrier of the green coloration is the dixenon(1+) cation, Xe[sub 2][sup +]. Quantitative studies of the UV-visible and Raman spectra of antimony pentafluoride solutions imply that the reversible formation of Xe[sub 2][sup +] takes place in accordance with the equilibrium 3Xe + XeF[sup +]Sb[sub 2]F[sub 11][sup [minus]] + 2SbF[sub 5] [r reversible] 2Xe[sub 2][sup +]Sb[sub 2]F[sub 11][sup [minus]], although a secondary equilibrium finds the Xe[sub 2][sup +] bound in a complex with an excess of the oxidant: Xe[sub 2][sup +]Sb[sub 2]F[sub 11][sup [minus]] + XeF[sup +]Sb[sub 2]F[sub 11][sup [minus]] [r reversible] Xe[sub 2][sup +]Sb[sub 2]F[submore » 11][sup [minus]][center dot]XeF[sup +]Sb[sub 2]F[sub 11][sup [minus]]. The spectroscopic properties of Xe[sub 2][sup +] are discussed in relation to those of the isoelectronic species I[sub 2][sup [minus]] and to the results of previous theoretical calculations. Of the media investigated to date antimony pentafluoride seems to be unique in its ability to support the Xe[sub 2][sup +] cation in appreciable concentrations at normal temperatures.« less |
| Databáze: | OpenAIRE |
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