Iridium(II) chloride
Iridium(II) chloride is an inorganic chemical compound of iridium metal and chlorine with the chemical formula IrCl2.[1][2] This is a metal salt of iridium and hydrochloric acid.
| Names | |
|---|---|
| Other names
Iridium dichloride, iridium bichloride | |
| Identifiers | |
3D model (JSmol) |
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| Properties | |
| Cl2Ir | |
| Molar mass | 263.12 g·mol−1 |
| Appearance | dark-green crystals |
| Melting point | 773 °C (1,423 °F; 1,046 K) |
| Practically insoluble | |
| Related compounds | |
Related compounds |
Osmium(II) chloride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Synthesis
- The substance is obtained by the interaction of powdered metallic iridium with chlorine gas when heated:[3][4]
- 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.[5] 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:[6]
- 2IrCl2 → 2IrCl + Cl2
At temperatures above 798 °C, complete decomposition of the substance occurs:
- IrCl2 → Ir + Cl2
References
- Regnault, Victor (1853). Elements of Chemistry: For the Use of Colleges, Academies, and Schools. Clark & Hesser. p. 355. Retrieved 31 March 2023.
- Kandiner, H. J. (3 September 2013). Iridium (in German). Springer-Verlag. p. 55. ISBN 978-3-662-12128-3. Retrieved 31 March 2023.
- Cooley, Arnold James (1880). A cyclopædia of practical receipts. p. 906. Retrieved 31 March 2023.
- Watts, Henry (1875). A Dictionary of Chemistry and the Allied Branches of Other Sciences. Longmans, Green, and Company. p. 318. Retrieved 31 March 2023.
- Friend, John Newton (1922). Cobalt, Nickel, and the Elements of the Platinum Group. Griffin. p. 243. Retrieved 31 March 2023.
- Satya, Prakash (2013). Advanced Chemistry of Rare Elements. S. Chand Publishing. p. 629. ISBN 978-81-219-4254-6. Retrieved 31 March 2023.
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