Potassium hexachloroplatinate

Potassium hexachloroplatinate is the inorganic compound with the formula K₂PtCl₆. It is a yellow solid that is a comparatively insoluble potassium salt. The salt features the hexachloroplatinate(IV) dianion, which has octahedral coordination geometry.

Potassium hexachloroplatinate

Identifiers
CAS Number	16921-30-5 Y
3D model (JSmol)	Interactive image
ChemSpider	55728
ECHA InfoCard	100.037.239
EC Number	240-979-3
PubChem CID	61856
RTECS number	TP1650000
UNII	99U3Q94QT1 Y
CompTox Dashboard (EPA)	DTXSID90926861
InChI InChI=1S/6ClH.2K.Pt/h6*1H;;;/q;;;;;;2*+1;+4/p-6 Key: DPAIVKJGTXERIM-UHFFFAOYSA-H
SMILES Cl[Pt-2](Cl)(Cl)(Cl)(Cl)Cl.[K+].[K+]
Properties
Chemical formula	K2PtCl6
Molar mass	485.99 g/mol
Appearance	orange to yellow solid
Density	3.344 g/cm3
Melting point	250 °C (482 °F; 523 K) (decomposes)
Solubility in water	0.89 g/100ml (at 25 °C) [1]
Solubility product (Ksp)	7.48×10−6[2]
Hazards
GHS labelling:[3]
Pictograms
Signal word	Danger
Hazard statements	H301, H317, H318, H334
Precautionary statements	P261, P264, P270, P272, P280, P285, P301+P310, P302+P352, P304+P341, P305+P351+P338, P310, P321, P330, P333+P313, P342+P311, P363, P405, P501
Flash point	250 °C (482 °F; 523 K)
Safety data sheet (SDS)	Oxford MSDS
Related compounds
Other anions	Potassium tetrachloroplatinate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

The precipitation of this compound from solutions of hexachloroplatinic acid was formerly used for the determination of potassium by gravimetric analysis.^[4] It is also useful as an intermediate in the recovery of platinum from wastes.^[5]

Reactions

Using salt metathesis reactions, potassium hexachloroplatinate is converted to a variety of quaternary ammonium and related lipophilic salts. These include tetrabutylammonium salt (NBu₄)₂PtCl₆, which has been investigated as a catalyst.^[6]

Reduction of potassium hexachloroplatinate with hydrazine dihydrochloride gives the corresponding tetrachloroplatinate salt.^[7][8]

Potassium hexachloroplatinate reacts with aqueous ammonia to give chloropentammineplatinum chloride:^[9]

K₂PtCl₆ + 5 NH₃ → [PtCl(NH₃)₅]Cl₃ + 2 KCl

Safety

Dust containing potassium hexachloroplatinate can be highly allergenic. "Symptoms range from irritation of skin and mucous membranes to life-threatening attacks of asthma."^[10]

Related compounds

• Ammonium hexachloroplatinate