Rubidium triiodide

Rubidium triiodide
Identifiers
CAS Number	12298-69-0 ;
3D model (JSmol)	Interactive image;
PubChem CID	23717888;
	InChI InChI=1S/I3.Rb/c1-3-2;/q-1;+1 Key: PXHPKMRCAYWMAT-UHFFFAOYSA-N;
	SMILES [Rb+].I[I-]I;
Properties
Chemical formula	RbI3
Appearance	black crystals
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Rubidium triiodide is an inorganic compound with the chemical formula RbI₃. It is composed of Rb⁺ and I⁻
₃.

Preparation

Rubidium triiodide can be obtained by heating rubidium iodide and iodine in aqueous solution:[1]

RbI + I₂ → RbI₃

Properties

Rubidium triiodide is an orthorhombic black crystal, isomorphic to caesium triiodide, with space group Pnma, unit cell parameters a = 1090.8 pm, b = 665.5 pm, c = 971.1 pm.[2] Upon heating to 270 °C, the rubidium triiodide decomposes into rubidium iodide and elemental iodine.[1] It is soluble in ethanol and decomposes in ether.[1]

Reactions

It has long been believed that rubidium triiodide reacts further with iodine to form RbI₇ and RbI₉,[3] but this has been refuted by recent studies.[4][2]

References

Wells, H. L.; Wheeler, H. L.; Penfield, S. L. (1892). "Über Trihalogenverbindungen des Rubidiums und Kaliums. nebst ihrer Krystallographie". Zeitschrift für anorganische Chemie. 1 (1): 442–455. doi:10.1002/zaac.18920010140.
Tebbe, K. F.; Georgy, U. (1986-12-15). "Die Kristallstruckturen von Rubidiumtriiodid und Thalliumtriiodid". Acta Crystallographica Section C Crystal Structure Communications. International Union of Crystallography (IUCr). 42 (12): 1675–1678. doi:10.1107/s0108270186090972. ISSN 0108-2701.
Abegg, R. (1906-09-21). "Über die festen Polyjodide der Alkalien, ihre Stabilität und Existenzbedingungen bei 25°". Zeitschrift für anorganische Chemie. Wiley. 50 (1): 403–438. doi:10.1002/zaac.19060500136. ISSN 0863-1778.
Briggs, T. R.; Patterson, E. S. (1932-10-01). "The Polyiodides of Rubidium. I". The Journal of Physical Chemistry. American Chemical Society (ACS). 36 (10): 2621–2624. doi:10.1021/j150340a011. ISSN 0092-7325.

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[Wells-1] Wells, H. L.; Wheeler, H. L.; Penfield, S. L. (1892). "Über Trihalogenverbindungen des Rubidiums und Kaliums. nebst ihrer Krystallographie". Zeitschrift für anorganische Chemie. 1 (1): 442–455. doi:10.1002/zaac.18920010140.

[Tebbe-2] Tebbe, K. F.; Georgy, U. (1986-12-15). "Die Kristallstruckturen von Rubidiumtriiodid und Thalliumtriiodid". Acta Crystallographica Section C Crystal Structure Communications. International Union of Crystallography (IUCr). 42 (12): 1675–1678. doi:10.1107/s0108270186090972. ISSN 0108-2701.

[Hamburger-3] Abegg, R. (1906-09-21). "Über die festen Polyjodide der Alkalien, ihre Stabilität und Existenzbedingungen bei 25°". Zeitschrift für anorganische Chemie. Wiley. 50 (1): 403–438. doi:10.1002/zaac.19060500136. ISSN 0863-1778.

[Briggs-4] Briggs, T. R.; Patterson, E. S. (1932-10-01). "The Polyiodides of Rubidium. I". The Journal of Physical Chemistry. American Chemical Society (ACS). 36 (10): 2621–2624. doi:10.1021/j150340a011. ISSN 0092-7325.