Iodine pentoxide
From Wikipedia, the free encyclopedia
| Iodine pentoxide | |
|---|---|
 |
|
| IUPAC name | diiodine heptoxide |
| Other names | iodine(V) oxide; iodic anhydride |
| Identifiers | |
| CAS number | [12029-98-0] |
| Properties | |
| Molecular formula | I2O5 |
| Molar mass | 333.81 g/mol |
| Appearance | white crystalline solid[1] |
| Density | 4.980 g cm−3[1] |
| Melting point |
? °C |
| Boiling point |
? °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 |
|
Iodine pentoxide is the chemical compound with the formula I2O5. This iodine oxide is the anhydride of iodic acid. It is produced by dehydrating iodic acid at 200 °C in a stream of dry air[1]:
- 2HIO3 → I2O5 + H2O
[edit] Structure
I2O5 is bent with an I-O-I angle of 139.2°, but the molecule has no mirror plane so its symmetry is not C2v. The terminal I-O distances are around 1.80 Å and the bridging I-O distances are around 1.95 Å[2].
[edit] Reactions
Iodine pentoxide easily oxidises carbon monoxide to carbon dioxide at room temperature:
- 5CO + I2O5 → I2 + 5CO2
This reaction can be used to analyse the concentration of CO in a gaseous sample.
I2O5 forms iodyl salts, [IO2+], with SO3 and S2O6F2, but iodosyl salts, [IO+], with concentrated sulfuric acid.
[edit] References
- ^ a b c Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4. pp. 851-852
- ^ K. Selte and A. Kjekshus (1970). "Iodine oxides: part III, The crystal structure of I2O5". Acta Chemica Scandinavica 24: 1912–1914.
 |
This inorganic compound-related article is a stub. You can help Wikipedia by expanding it. |
