Everything about Iridium Iii Chloride totally explained
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Iridium(III) chloride is the
chemical compound with the
formula IrCl
3. 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.
Preparation
Iridium is separated from the other
platinum group metals as crystalline ammonium hexachloroiridate(IV), [NH
4]
2[IrCl
6] (
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.
Uses
Iridium(III) chloride is used as a starting material for the preparation of other iridium compounds.
Vaska's complex,
trans-[IrCl(CO)(PPh
3)
2], is prepared by refluxing IrCl
3 in
dimethylformamide with excess
triphenylphosphine.
Alkene complexes such as the dimeric
2[ can also be prepared by refluxing IrCl3 with the appropriate alkene in water/alcohol mixtures.
]Safety
Iridium(III) chloride isn't 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).
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