Rubidium triiodide

Crystal structure
__ Rb +      __ I 1 / 3−
Crystal system	orthorhombic
Space group	Pnma (No. 62)
Lattice parameters	a = 1090.8 pm, b = 665.5 pm, c = 971.1 pm
General
Surname	Rubidium triiodide
Ratio formula	RbI 3
Brief description	black, shiny crystals
External identifiers / databases
CAS number 12298-69-0 Wikidata Q1651653
properties
Molar mass	466.18  g · mol -1
Physical state	firmly
density	4.03 g cm −3
Melting point	192  ° C
solubility	easily soluble in water
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 .

Rubidium triiodide is a chemical compound made up of the elements rubidium and iodine .

Manufacturing

Rubidium triiodide is made from rubidium iodide and elemental iodine in an aqueous solution by heating.

${\displaystyle {\ce {RbI + I2 -> RbI3}}}$

properties

Physical Properties

Rubidium triiodide crystallizes in the orthorhombic crystal system with the space group Pnma (space group no. 62) and the lattice parameters a = 1090.8 pm, b = 665.5 pm and c = 971.1 pm, in the unit cell there are four formula units . The crystal structure is isotypic with cesium triiodide . When heated to 270 ° C, the rubidium triiodide decomposes into rubidium iodide and elemental iodine. Rubidium triiodide is soluble in ethanol ; it decomposes in ether .

Chemical properties

For a long time it was assumed that rubidium triiodide reacts further with iodine to form higher polyiodides RbI ₇ and RbI ₉ . However, this has been refuted by recent research.

Individual evidence

1. ↑ ^{a b c d} Jean D'Ans, Ellen Lax: Pocket book for chemists and physicists. 3. Elements, inorganic compounds and materials, minerals, Volume 3. 4. Edition, Springer, 1997, ISBN 978-3-5406-0035-0 , p. 688 ( limited preview in the Google book search).
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
3. ↑ ^{a b c} HL. Wells, HL Wheele: About trihalogen compounds of rubidium and potassium . In: Journal of Inorganic Chemistry . tape 1 , 1892, p. 442 ff ., doi : 10.1002 / zaac.18920010140 ( full text ).
4. ↑ ^{a b} K. F. Tebbe, U. Georgy: The crystal structures of rubidium triiodide and thallium triiodide . In: Acta Crystallographica Section C . tape 42 , no. December 12 , 1986, pp. 1675-1678 , doi : 10.1107 / S0108270186090972 .
5. ↑ Anna Hamburger, R. Abegg: About the fixed polyiodides of alkalis, their stability and living conditions at 25 ° C . In: Journal of Inorganic Chemistry . tape 50 , no. 1 , 1906, p. 403-438 , doi : 10.1002 / zaac.19060500136 ( full text ).
6. ^ TR Briggs, ES Patterson: The Polyiodides of Rubidium . In: The Journal of Physical Chemistry . tape 36 , no. 10 , 1932, p. 2621–2624 , doi : 10.1021 / j150340a011 ( full text ).