Iridium(II) chloride
| Names | |
|---|---|
| Other names
Iridium dichloride, iridium bichloride
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| 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
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Osmium(II) chloride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.
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
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