Iridium(IV) iodide

Iridium(IV) iodide
Names
	Other names Iridium(IV) iodide, tetraiodoiridium
Identifiers
CAS Number	7790-45-6;
3D model (JSmol)	Interactive image;
ChemSpider	22504631;
ECHA InfoCard	100.029.279
EC Number	232-206-3;
PubChem CID	25113453;
CompTox Dashboard (EPA)	DTXSID70999093;
	InChI InChI=1S/4HI.Ir/h4*1H;/q;;;;+4/p-4 Key: BUUWLOZTIYBNKB-UHFFFAOYSA-J;
	SMILES I[Ir](I)(I)I;
Properties
Chemical formula	I4Ir
Molar mass	699.835 g·mol−1
Appearance	Black powder
Melting point	100 °C (212 °F; 373 K)
Solubility in water	insoluble
Structure
Crystal structure	hexagonal
Related compounds
Related compounds	Iridium triiodide, platinum tetraiodide
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Iridium(IV) iodide is a binary inorganic compound of iridium and iodide with the chemical formula IrI
₄.^[2]

Properties

Iridium tetraiodide forms black crystals, does not dissolve in water and alcohol.^[3]^[4] In alkali metal iodide solutions, the compound dissolves easily to give a ruby red solution, forming complex salts.^[5]

The compound decomposes when heated:

IrI₄ → Ir + 2I₂

Preparation

Iridium(IV) iodide can be obtained by reacting dipotassium hexachloroiridate or hexachloroiridic acid with an aqueous solution of potassium iodide.^[6]^[5]

Uses

Iridium(IV) iodide can be used as a catalyst in organic chemistry.^[7]^[8]

References

↑ PubChem. "Iridium iodide (IrI4)". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-04-06.
↑ Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3507. ISBN 978-0-412-30120-9. Retrieved 3 May 2023.
↑ Comey, Arthur Messenger (1896). A Dictionary of Chemical Solubilities Inorganic: xx, 515 p. Macmillan & Company. p. 193. Retrieved 3 May 2023.
↑ Roscoe, Henry Enfield; Schorlemmer, Carl (1895). A Treatise on Chemistry. D. Appleton. p. 445.
1 2 Kandiner, H. J. (2013-09-03). Iridium (in German). Springer-Verlag. ISBN 978-3-662-12128-3.
↑ "Studies on iridium compounds". discover.dtic.mil. Retrieved 2023-10-16.
↑ Nobel, Dominique (8 August 1996). "Method for preparing iridium iodides and use thereof as catalysts". Retrieved 3 May 2023.
↑ "Iridium(IV) iodide". Alfa Aesar. Retrieved 3 May 2023.

[1] PubChem. "Iridium iodide (IrI4)". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-04-06.

[2] Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3507. ISBN 978-0-412-30120-9. Retrieved 3 May 2023.

[3] Comey, Arthur Messenger (1896). A Dictionary of Chemical Solubilities Inorganic: xx, 515 p. Macmillan & Company. p. 193. Retrieved 3 May 2023.

[4] Roscoe, Henry Enfield; Schorlemmer, Carl (1895). A Treatise on Chemistry. D. Appleton. p. 445.

[Kandiner-5] 1 2 Kandiner, H. J. (2013-09-03). Iridium (in German). Springer-Verlag. ISBN 978-3-662-12128-3.

[6] "Studies on iridium compounds". discover.dtic.mil. Retrieved 2023-10-16.

[7] Nobel, Dominique (8 August 1996). "Method for preparing iridium iodides and use thereof as catalysts". Retrieved 3 May 2023.

[Alfa-8] "Iridium(IV) iodide". Alfa Aesar. Retrieved 3 May 2023.

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