Diiodotetraoxide
Structural formula | |||||||
---|---|---|---|---|---|---|---|
No drawing available | |||||||
General | |||||||
Surname | Diiodotetraoxide | ||||||
other names |
Diiodetroxide |
||||||
Molecular formula | I 2 O 4 | ||||||
Brief description |
yellow powder |
||||||
External identifiers / databases | |||||||
|
|||||||
properties | |||||||
Molar mass | 317.81 g mol −1 | ||||||
Physical state |
firmly |
||||||
density |
4.2 g cm −3 |
||||||
Melting point |
130 ° C |
||||||
solubility |
|
||||||
safety instructions | |||||||
|
|||||||
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Diiodotetraoxide , I 2 O 4 , is a chemical compound between oxygen and iodine . It belongs to the group of iodine oxides .
Extraction and presentation
The oxide is formed by the action of hot concentrated sulfuric acid on the iodic acid for several days .
It is formed from diiodine pentoxide and iodine in concentrated sulfuric acid via bis (iodosyl) sulphate (IO) 2 SO 4 according to:
properties
Diiodine tetraoxide is a yellow, granular powder. From temperatures of 85 ° C it decomposes to diiodine pentoxide and iodine:
This process is all the faster at 135 ° C. It dissolves in hot water to form iodate and iodide. Structurally, the compound is an iodyl iodite O 2 I-OIO (iodine (V, III) oxide) with angled I V O 2 units (IO distances 1.80 and 1.85 Å; OIO angle 97 °) and angled I III O 2 units (IO distances 1.93 Å, OIO angles 95.8 °). Both units are linked by I — O — I bridges to form polymeric zigzag chains (I 2 O 4 ) x .
Diiodotetraoxide has a monoclinic crystal structure with the space group P 2 1 / c (space group no. 14) .
Individual evidence
- ^ A b c d e Egon Wiberg, AF Holleman, Nils Wiberg: Inorganic Chemistry . Academic Press, 2001, ISBN 0-12-352651-5 , pp. 465 .
- ^ William M. Haynes: CRC Handbook of Chemistry and Physics . CRC Press, 2014, ISBN 1-4822-0868-7 , pp. 4-67 .
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ^ HJ Emeléus, AG Sharpe: Advances in Inorganic Chemistry and Radiochemistry . tape 5 . Academic Press, 1963, ISBN 0-08-057854-3 , pp. 77-78 .
- ↑ Zhongqing Wu, Rajiv K. Kalia et al. a .: First-principles calculations of the structural and dynamic properties, and the equation of state of crystalline iodine oxides I2O4, I2O5, and I2O6. In: The Journal of Chemical Physics. 134, 2011, p. 204501, doi : 10.1063 / 1.3590278 .