Diiodohexoxide

Crystal structure
__ I __ O
Crystal system	triclinic
Space group	P 1 (No. 2)
Lattice parameters	a  = 5.006 Å, b  = 6.741 Å, c  = 6.795 Å, α = 97.1 °, β = 96.43 °, γ = 105.36 °
General
Surname	Diiodohexoxide
Ratio formula	I 2 O 6
Brief description	yellow solid
External identifiers / databases
CAS number 65355-99-9 Wikidata Q66725210
properties
Molar mass	349.805 g mol −1
Physical state	firmly
density	4.53 g cm −3
Melting point	150 ° C (decomposition)
safety instructions
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 .

Diiodohexaoxide is an inorganic compound which, as iodine oxide, belongs to the halogen oxides .

presentation

Diiodohexaoxide can be prepared in a variety of ways. Periodic acid can be dehydrated using concentrated sulfuric acid :

${\displaystyle \mathrm {H_{5}IO_{6}\ {\xrightarrow[{-H_{2}O}]{H_{2}SO_{4}}}\ I_{2}O_{6}} }$.

Alternatively, it can be represented by reacting periodic acid with iodic acid with sulfuric acid.

${\displaystyle {\ce {HIO3 + H5IO6 -> I2O6 + 3H2O}}}$

The thermal decomposition of meta -periodic acid in vacuo also leads to the preparation of diiodohexaoxide.

properties

Diiodohexaoxide can be stored stably under 100 ° C under exclusion of moisture. When dissolving in water, an exothermic reaction to iodic and periodic acid takes place. When heated above 150 ° C, the decomposition in diiodopentoxide can be observed;

${\displaystyle {\ce {2I2O6 ->[\Delta T] 2I2O5 + O2}}}$.

The compound is diamagnetic , which is attributed to the different oxidation numbers of the iodine atoms. As a solid, the compound crystallizes in space group P 1 (space group number 2) with the lattice constants a  = 500.6 pm, b  = 674.1 pm, c  = 679.5 pm, α = 97.1 °, β = 96.43 ° , γ = 105.36 ° with one formula unit per unit cell.

Individual evidence

1. ↑ ^{a b c d} Thorsten Kraft, Martin Jansen: Synthesis and Crystal Structure of Diiodine (V / VII) Hexaoxide: An Intermediate between a Molecular and a Polymer Solid . In: J. Am. Chem. Soc. tape 117 , no. June 25 , 1995, p. 6795-6796 , doi : 10.1021 / ja00130a026 .
2. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 96th edition. (Internet version:), CRC Press / Taylor and Francis, Boca Raton, FL, Properties of the Elements and Inorganic Compounds, pp. 4-67.
3. ^ ^{A b c} A. F. Holleman , N. Wiberg : Inorganische Chemie . 103rd edition. Volume 1: Basics and main group elements. Walter de Gruyter, Berlin / Boston 2016, ISBN 978-3-11-049585-0 , pp. 543-544 (reading sample: Part A - Basics of the chemistry of hydrogen. Google book search ).
4. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
5. ^ ^{A b} Hans Siebert, Manfred Weise, Ursula Woerner: About the iodine (V, VII) oxide I ₂ O ₆ . In: Z. anorg. gen. Chem. Band 432 , no. 1 , July 1977, p. 136-140 , doi : 10.1002 / zaac.19774320117 .