Iridium(III) chloride

Iridium(III) chloride
	Trihydrate
Names
	Other names Iridium trichloride
Identifiers
CAS Number	10025-83-9 (anhydrous) ; 14996-61-3 (hydrate);
3D model (JSmol)	Interactive image;
ChemSpider	23837 ;
ECHA InfoCard	100.030.028
EC Number	233-044-6;
PubChem CID	82301;
UNII	20278OEG45 ;
CompTox Dashboard (EPA)	DTXSID10275787 ;
	InChI InChI=1S/3ClH.Ir/h3*1H;/q;;;+3/p-3 Key: DANYXEHCMQHDNX-UHFFFAOYSA-K;
	SMILES [Cl-].[Cl-].[Cl-].[Ir+3];
Properties
Chemical formula	IrCl3
Molar mass	298.58 g/mol (anhydrous) 316.60 g/mol (hydrate)
Appearance	brown solid (α-anhydrous); red solid (β-anhydrous); dark green solid (trihydrate)
Density	5.30 g/cm3, solid
Melting point	763 °C (1,405 °F; 1,036 K) (decomposes)
Solubility in water	insoluble (anhydrous IrCl3), soluble (hydrated derivative)
Solubility	Insoluble in HCl and alkanes
Magnetic susceptibility (χ)	−14.4·10−6 cm3/mol
Structure
Crystal structure	Monoclinic, mS16
Space group	C12/m1, No. 12
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	−257 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H411
Flash point	non-flammable
Related compounds
Other cations	Rhodium(III) chloride
Related compounds	Platinum(II) chloride
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Iridium(III) chloride is the inorganic compound with the formula IrCl₃. The anhydrous compound is relatively rare, but the related hydrate is much more commonly encountered. The anhydrous salt has two polymorphs, α and β, which are brown and red colored respectively. More commonly encountered is the hygroscopic dark green trihydrate IrCl₃(H₂O)₃ which is a common starting point for iridium chemistry.