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
Wikidata	Q66711943
properties
Molar mass	317.81 g mol −1
Physical state	firmly
density	4.2 g cm −3
Melting point	130 ° C
solubility	sparingly soluble in cold water; reacts with hot water to form iodic acid and iodine;
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	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 .

{\ displaystyle {\ ce {3 HIO3 -> I2O4 + HIO4 + H2O}}}

It is formed from diiodine pentoxide and iodine in concentrated sulfuric acid via bis (iodosyl) sulphate (IO) ₂ SO ₄ according to:

{\ displaystyle {\ ce {4 (IO) 2SO4 + 4 H2O -> I2O4 + I2 + 4 H2SO4}}}

properties

Diiodine tetraoxide is a yellow, granular powder. From temperatures of 85 ° C it decomposes to diiodine pentoxide and iodine:

{\ displaystyle {\ ce {5 I2O4 -> 4 I2O5 + I2}}}

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) . Template: room group / 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 .

[Inorganic_Chemistry-1] A ^b ^c ^d ^e Egon Wiberg, AF Holleman, Nils Wiberg: Inorganic Chemistry . Academic Press, 2001, ISBN 0-12-352651-5 , pp. 465 .

[2] William M. Haynes: CRC Handbook of Chemistry and Physics . CRC Press, 2014, ISBN 1-4822-0868-7 , pp. 4-67 .

[NV-3] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[4] HJ Emeléus, AG Sharpe: Advances in Inorganic Chemistry and Radiochemistry . tape 5 . Academic Press, 1963, ISBN 0-08-057854-3 , pp. 77-78 .

[DOI10.1063/1.3590278-5] 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 .