Ammonium hexachloroiridate(IV) Property

Melting point:

decomposes [STR93]

Density 

2.86 g/mL at 25 °C(lit.)

storage temp. 

under inert gas (nitrogen or Argon) at 2-8°C

form 

Crystalline Powder

Specific Gravity

2.856

color 

Red-black

Water Solubility 

Soluble in water.

Sensitive 

Hygroscopic

Stability:

hygroscopic

CAS DataBase Reference

16940-92-4(CAS DataBase Reference)

EPA Substance Registry System

Iridate(2-), hexachloro-, diammonium, (OC-6-11)- (16940-92-4)

Safety

Hazard Codes 

Xn

Risk Statements 

36/38-22-20/21/22

Safety Statements 

26-36/37/39-45

RIDADR 

1759

WGK Germany 

3

RTECS 

BP5295000

TSCA 

Yes

HazardClass 

8

PackingGroup 

III

Toxicity

rat,LD50,oral,1852mg/kg (1852mg/kg),Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 21(7), Pg. 55, 1977.

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

Ammonium hexachloroiridate(IV) Chemical Properties,Usage,Production

Chemical Properties

Olive Green Crystals

Uses

Ammonium Hexachloroiridate(IV) is a reagent used for research applications and is used for catalytic production on hydrogen.
It is a key intermediate in the isolation of iridium from ores. Most other metals form insoluble sulfides when aqueous solutions of their chlorides are treated with hydrogen sulfide, but [IrCl6]2? resists ligand substitution. Upon heating under hydrogen, the solid salt converts to the metal:
(NH4)2[IrCl6] + 2 H2→ Ir + 6 HCl + 2 NH3

Uses

Iridium complexes are generated from ammonium hexachloroiridate.

Definition

ChEBI: Ammonium hexachloroiridate is a salt comprising separate ammonium cations and octahedral [IrCl6](2-) anions. It contains a hexachloroiridate(2-).

Flammability and Explosibility

Non flammable

Purification Methods

It is precipitated several times from aqueous solution by saturation with ammonium chloride. This removes any palladium and rhodium. It is then washed with ice-cold water and dried over conc H2SO4 in a vacuum desiccator. If osmium or ruthenium is present, it can be removed as the tetroxide by heating with conc HNO3, followed by conc HClO4, until most of the acid has been driven off. (This treatment is repeated. ) The near-dry residue is dissolved in a small amount of water and added to excess NaHCO3 solution and bromine water. On boiling, iridic (but not platinic) hydroxide is precipitated. It is dissolved in HCl and precipitated several times, then dissolved in HBr and treated with HNO3 and HCl to convert the bromides to chlorides. Saturation with ammonium chloride and cooling precipitates ammonium hexachloroiridate which is filtered off and purified as above [Woo & Yost J Am Chem Soc 53 884 1931].