Dichlorine heptoxide
From Wikipedia, the free encyclopedia
| Dichlorine heptoxide | |
|---|---|
 |
|
| IUPAC name | Dichlorine-heptoxide |
| Other names | Chlorine(VII) oxide; Perchloric anhydride; (Perchloryloxy)chlorane trioxide |
| Identifiers | |
| CAS number | [12015-53-1] |
| Properties | |
| Molecular formula | Cl2O7 |
| Molar mass | 182.901 g/mol |
| Appearance | colorless oil |
| Density | l900 kg m-3 |
| Melting point |
−91.5 °C |
| Boiling point |
82 °C |
| Hazards | |
| Main hazards | oxidizer |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
|
Dichlorine heptoxide is the chemical compound with the formula Cl2O7. This chlorine oxide is the anhydride of perchloric acid. It is produced by the careful distillation of perchloric acid in the presence of the dehydrating agent phosphorus pentoxide:[1]
- 2 HClO4 + P4O10 → Cl2O7 + H2P4O11
It slowly hydrolyzes back to perchloric acid, which is also hazardous when anhydrous.
Cl2O7 is an endothermic molecule, which means that it is intrinsically unstable.
- Cl2O7 → Cl2 + 3.5 O2 ΔH = 135 kJ/mol
Cl2O7 is bent with Cl-O-Cl angle of 118.6° giving the molecule C2 symmetry. The terminal Cl-O distances are 1.709 Å and the Cl=O distances are 1.405 Å.[1] In this compound, chlorine exists in its highest formal oxidation state of 7+, although the bonding in this hypervalent molecule is significantly covalent.
[edit] Safety
Cl2O7 is strong oxidizer as well as an explosive that can be set off with flame or mechanical shock.
[edit] References
- ^ a b Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
[edit] External links
 |
This inorganic compound-related article is a stub. You can help Wikipedia by expanding it. |
