Other compounds of noble gases
المؤلف:
Peter Atkins, Tina Overton, Jonathan Rourke, Mark Weller, and Fraser Armstrong
المصدر:
Shriver and Atkins Inorganic Chemistry ,5th E
الجزء والصفحة:
ص446-447
2025-09-22
348
Other compounds of noble gases
Key point: Krypton and radon fluorides are known but their chemical properties are much less extensive than those of xenon. Radon has a lower ionization energy than Xe, so it can be expected to form compounds even more readily. Evidence exists for the formation of RnF2, and cationic compounds, such as [RnF][SbF6], but detailed characterization is frustrated by their radioactivity. Krypton has a much higher ionization energy than Xe (Table 18.1) and its ability to form compounds is more limited. Krypton difluoride, KrF2, is prepared by passing an electric discharge or ionizing radiation through a fluorine krypton mixture at low temperatures (-196°C). As with XeF2, the krypton compound is a colourless volatile solid and the molecule is linear. It is an endergonic and highly reactive compound that must be stored at low temperatures. When monomeric HF is photolysed in solid argon and annealed to 18 K, HArF is formed. This compound is stable up to 27K and contains the HAr and F ions. The related molecular ions, HHe+, HNe, and HXe have been observed by spectroscopy. The heavier noble gases form clathrates. Argon, Kr, and Xe form clathrates with quinol (1,4-C6H4 (OH)2) with one gas atom to three quinol molecules. They also form clathrate hydrates.
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