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 dianion, which has octahedral coordination geometry.
The precipitation of this compound from solutions of hexachloroplatinic acid was formerly used for the determination of potassium by gravimetric analysis. It is also useful as an intermediate in the recovery of platinum from wastes.

Reactions

Using salt metathesis reactions, potassium hexachloroplatinate is converted to a variety of quaternary ammonium and related lipophilic salts. These include tetrabutylammonium salt 2PtCl6, which has been investigated as a catalyst.
Reduction of potassium hexachloroplatinate with hydrazine dihydrochloride gives the corresponding tetrachloroplatinate salt.
Potassium hexachloroplatinate reacts with aqueous ammonia to give chloropentammineplatinum chloride:

Safety

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

Related compounds