Xenon-Oxygen Compounds
Master the preparation, hydrolysis, and VSEPR geometries of $XeO_3$, $XeOF_4$, and $XeO_2F_2$.
While Xenon directly reacts with Fluorine to form fluorides, its oxygen compounds are primarily obtained indirectly through the **hydrolysis** of those fluorides. The interaction of Xenon fluorides with water yields a fascinating series of oxides and oxyfluorides, which are highly tested for their complex VSEPR geometries and explosive properties.
1. Preparation: The Hydrolysis Reactions
Xenon fluorides ($XeF_4$ and $XeF_6$) undergo hydrolysis (reaction with water) to yield oxygen-containing Xenon compounds. The specific product depends on whether the hydrolysis is complete or partial.
A. Complete Hydrolysis (Yields $XeO_3$)
When provided with excess water, both $XeF_4$ and $XeF_6$ are completely hydrolyzed to form Xenon trioxide ($XeO_3$).
$XeF_6 + 3H_2O \rightarrow \mathbf{XeO_3} + 6HF$
B. Partial Hydrolysis of $XeF_6$ (The Exam Trap)
If the amount of water is limited, $XeF_6$ undergoes partial hydrolysis. By carefully controlling the stoichiometry, two distinct oxyfluorides can be isolated.
1. With one mole of water:
Yields Xenon oxytetrafluoride ($XeOF_4$).
2. With two moles of water:
Yields Xenon dioxydifluoride ($XeO_2F_2$).
2. Physical Properties
It is a colorless, highly explosive crystalline solid. It is also highly hygroscopic (absorbs moisture from the air). Because of its explosive nature, it must be handled with extreme care.
It is a colorless, volatile liquid.
3. VSEPR Geometries & Hybridization
The most frequently tested aspect of these compounds is their structural geometry. Remember that Xenon has 8 valence electrons, and Oxygen atoms form double bonds (using 2 electrons from Xe for each O atom).
| Compound | Electron Pairs (Central Xe) | Hybridization | Molecular Shape |
|---|---|---|---|
| $XeO_3$ | 3 Bond Pairs (Double bonds) + 1 Lone Pair |
$sp^3$ | Pyramidal |
| $XeOF_4$ | 5 Bond Pairs (4 single, 1 double) + 1 Lone Pair |
$sp^3d^2$ | Square Pyramidal |
| $XeO_2F_2$ | 4 Bond Pairs (2 single, 2 double) + 1 Lone Pair |
$sp^3d$ | See-Saw |
Figure 1: VSEPR theory states that lone pairs and double bonds occupy positions that minimize repulsion. In XeO₂F₂, the lone pair and double bonds occupy the spacious equatorial positions.
Mastery Check: Xenon Oxygen Compounds
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