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Iridium(III) chloride

Safety data
Other names Iridium trichloride
CAS number 10025-83-9
EINECS number 233-044-6
Molecular formula IrCl3
Molar mass 298.58 g/mol (anhydrous)
Appearance dark green solid
Density 5.30 g/cm3, solid
Melting point

763 °C (decomp.)

Solubility in water soluble
Std enthalpy of
-257 kJ/mol
EU classification not listed
Flash point non-flammable
Related Compounds
Other anions Iridium(III) fluoride
Iridium(III) bromide
Iridium(III) iodide
Other cations Iridium(II) chloride
Iridium(IV) chloride
Rhodium(III) chloride
Related compounds Osmium(III) chloride
Platinum(II) chloride
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Iridium(III) chloride is the chemical compound with the formula IrCl3. This salt and the related hydrate are the principal starting materials for most iridium chemistry. The anhydrous salt is a dark green crystalline solid, which is very hygroscopic. It is usually encountered as a non-stoïchiometric hydrate CAS number [14996-61-3]) which has a highly variable water content.



Iridium is separated from the other platinum group metals as crystalline ammonium hexachloroiridate(IV), [NH4]2[IrCl6] (CAS number [16940-92-4]), which can be reduced to iridium metal in a stream of hydrogen. The spongy metal produced is reacted with chlorine at 300-400°C to produce iridium(III) chloride.


Iridium(III) chloride is used as a starting material for the preparation of other iridium compounds. Vaska's complex, trans-[IrCl(CO)(PPh3)2], is prepared by refluxing IrCl3 in dimethylformamide with excess triphenylphosphine.[1] Alkene complexes such as the dimeric {Ir(COD)Cl}2[2],[3] and {Ir(cycloctene)2Cl}2[3][2] can also be prepared by refluxing IrCl3 with the appropriate alkene in water/alcohol mixtures.


Iridium(III) chloride is not listed under Annex I of Directive 67/548/EEC, but is usually classified as irritant, R36/37/38: Irritating to eyes, respiratory system and skin. It is listed in the inventory of the Toxic Substances Control Act (TSCA).


  • Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4. 


  1. ^ Vaska, L.; & DiLuzio, J. W. (1961) J. Am. Chem. Soc. 83:2784. Girolami, G.S.; Rauchfuss, T.B.; Angelici, R.J. (1999). Synthesis and Technique in Inorganic Chemistry (3rd Edn.). Sausalito:University Science Books.
  2. ^ a b Winkhaus, G.; & Singer, H. (1966). Iridium(I)-Olefinkomplexe. Chem. Ber. 99:3610–18.
  3. ^ a b Herde, J. L.; Lambert, J. C.; & Senoff, C. V. (1974). Cyclooctene and 1,5-Cyclooctadiene Complexes of Iridium(I). Inorg. Synth. 15:18–20.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Iridium(III)_chloride". A list of authors is available in Wikipedia.
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