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Potassium hexachloroplatinate is the inorganic compound with the formula K2PtCl6. It is a yellow solid that is an example of a comparatively insoluble potassium salt. The salt features the
hexachloroplatinate Hexachloroplatinate is an anion with the chemical formula tCl6sup>2−. Chemical compounds containing the hexachloroplatinate anion include: * Chloroplatinic acid (or dihydrogen hexachloroplatinate), H2PtCl6 * Ammonium hexachloroplatinate, (NH4) ...
(IV) dianion, which has
octahedral coordination geometry In chemistry, octahedral molecular geometry, also called square bipyramidal, describes the shape of compounds with six atoms or groups of atoms or ligands symmetrically arranged around a central atom, defining the vertices of an octahedron. The oc ...
. The precipitation of this compound from solutions of
hexachloroplatinic acid Chloroplatinic acid (also known as hexachloroplatinic acid) is an inorganic compound with the formula 3Osub>2 tCl6H2O)''x'' (0 ≤ ''x'' ≤ 6). A red solid, it is an important commercial source of platinum, usually as an aqueous solution. Alth ...
was formerly used for the determination of potassium by
gravimetric analysis Gravimetric analysis describes a set of methods used in analytical chemistry for the quantitative determination of an analyte (the ion being analyzed) based on its mass. The principle of this type of analysis is that once an ion's mass has been ...
. It is also useful as an intermediate in the recovery of platinum from wastes.


Reactions

Using
salt metathesis A salt metathesis reaction, sometimes called a double displacement reaction, is a chemical process involving the exchange of bonds between two reacting chemical species which results in the creation of products with similar or identical bonding a ...
reactions, potassium hexachloroplatinate is converted to a variety of quaternary ammonium and related lipophilic salts. These include
tetrabutylammonium Tetrabutylammonium is a quaternary ammonium cation with the formula (C4H9)4sup>+. It is used in the research laboratory to prepare lipophilic salts of inorganic anions. Relative to tetraethylammonium derivatives, tetrabutylammonium salts are mor ...
salt (NBu4)2PtCl6, known as Lukevics catalyst. Reduction of potassium hexachloroplatinate with hydrazine dihydrochloride gives the corresponding tetrachloroplatinate salt.


References

{{Chlorine compounds Potassium compounds Hexachloroplatinates