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Iridium(II) chloride is an inorganic chemical compound of iridium metal and chlorine with the chemical formula IrCl₂. This is a metal salt of iridium and hydrochloric acid.

Synthesis

• The substance is obtained by the interaction of powdered metallic iridium with chlorine gas when heated:

Ir + Cl₂ → IrCl₂

• Iridium(II) chloride can also be made in a reaction between iridium(III) chloride and metallic iridium:

2IrCl₃ + Ir → 3IrCl₂

Physical properties

Iridium dichloride forms shiny dark-green crystals that are practically insoluble in water. Poorly soluble in acids and alkali. When heated to 773 °C, IrCl₂ decomposes without melting.

The standard Gibbs energy of the formation of ΔG (298 K, kJ/mol) is -139.7.

Chemical properties

When heated to 773 °C decomposes according to the equation:

2IrCl₂ → 2IrCl + Cl₂

At temperatures above 798 °C, complete decomposition of the substance occurs:

IrCl₂ → Ir + Cl₂

References

1. Regnault, Victor (1853). Elements of Chemistry: For the Use of Colleges, Academies, and Schools. Clark & Hesser. p. 355. Retrieved 31 March 2023.
2. Kandiner, H. J. (3 September 2013). Iridium (in German). Springer-Verlag. p. 55. ISBN 978-3-662-12128-3. Retrieved 31 March 2023.
3. Cooley, Arnold James (1880). A cyclopædia of practical receipts. p. 906. Retrieved 31 March 2023.
4. Watts, Henry (1875). A Dictionary of Chemistry and the Allied Branches of Other Sciences. Longmans, Green, and Company. p. 318. Retrieved 31 March 2023.
5. Friend, John Newton (1922). Cobalt, Nickel, and the Elements of the Platinum Group. Griffin. p. 243. Retrieved 31 March 2023.
6. Satya, Prakash (2013). Advanced Chemistry of Rare Elements. S. Chand Publishing. p. 629. ISBN 978-81-219-4254-6. Retrieved 31 March 2023.

• Iridium compounds
• Chlorides
• Metal halides