Rhodium(III) chloride

Rhodium(III) chloride
	Trihydrate
Names
	Other names Rhodium trichloride
Identifiers
CAS Number	10049-07-7 ; 13569-65-8 (trihydrate) [ICSC];
3D model (JSmol)	Interactive image;
ChemSpider	8096382 ;
ECHA InfoCard	100.030.138
EC Number	233-165-4;
PubChem CID	24872;
RTECS number	VI9290000;
UNII	Q4D88MX3Z8 ;
CompTox Dashboard (EPA)	DTXSID5044497 ;
	InChI InChI=1S/3ClH.Rh/h31H;/q;;;+3/p-3 Key: SONJTKJMTWTJCT-UHFFFAOYSA-K ; InChI=1S/3ClH.Rh/h31H;/q;;;+3/p-3; Key: SONJTKJMTWTJCT-UHFFFAOYSA-K;
	SMILES [Rh+3].[Cl-].[Cl-].[Cl-];
Properties
Chemical formula	RhCl3
Molar mass	209.26 g/mol
Appearance	anhydrous: red-brown solid; trihydrate: dark red;
Density	5.38 g/cm3
Melting point	anhydrous: 450 °C (842 °F; 723 K); trihydrate: decomposes above 100 °C (212 °F; 373 K);
Solubility in water	anhydrous: insoluble; trihydrate: very soluble;
Solubility	anhydrous: insoluble in acids, soluble in hydroxide and cyanide solutions, also soluble in aqua regia; trihydrate: very soluble in alcohols;
Magnetic susceptibility (χ)	−7.5·10−6 cm3/mol
Structure
Crystal structure	Monoclinic, mS16
Space group	C12/m1, No. 12
Lattice constant	a = 5.95 Å, b = 10.3 Å, c = 6.03 Å α = 90°, β = 109.2°, γ = 90°
Lattice volume (V)	348.993 Å3
Formula units (Z)	4
Coordination geometry	octahedral
Thermochemistry
Std enthalpy of; formation (ΔfH⦵298)	−234 kJ/mol
Hazards
Flash point	Nonflammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	>500 mg/kg (rat, oral); 1302 mg/kg (rat, oral)
Safety data sheet (SDS)	ICSC 0746
Related compounds
Other anions	Rhodium(III) fluoride; Rhodium(III) bromide; Rhodium(III) iodide
Other cations	Cobalt(II) chloride; Iridium(III) chloride
Related compounds	Ruthenium(III) chloride; Palladium(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

Rhodium(III) chloride refers to inorganic compounds with the formula RhCl₃(H₂O)_n, where n varies from 0 to 3. These are diamagnetic red-brown solids. The soluble trihydrated (n = 3) salt is the usual compound of commerce. It is widely used to prepare compounds used in homogeneous catalysis.