Iridium(II) chloride explained

Iridium(II) chloride is an inorganic chemical compound of iridium metal and chlorine with the chemical formula .^{[1] [2]} 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:^{[3] [4]}

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

Physical properties

Iridium dichloride forms shiny dark-green crystals that are practically insoluble in water.^[5] Poorly soluble in acids and alkali. When heated to 773 °C, 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:^[6]

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

Notes and References

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