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Dihydrogen hexachloroplatinate(IV) hexahydrate
is the chemical compound
with the formula H2
. Also known as hexachloroplatinic acid
or chloroplatinic acid
, it is one of the most readily available soluble compounds of platinum
. Unusually, it is rarely obtained in the pure state. The commercial product is the oxonium salt of the hexachloroplatinate(IV) anion. Therefore, the correct formula is [H3
O.(5,6) The related palladium compound,[H3
] is extremely unstable and has not been isolated in pure form.
Chloroplatinic acid is produced by dissolving platinum metal sponge
in aqua regia
. This reaction is rumored to produce nitrogen-containing platinum compounds, but the product is H2
. Chloroplatinic acid is brownish-red, and can be isolated by evaporating this solution to a syrup.
- Pt + 4 HNO3 + 6 HCl → H2PtCl6 + 4 NO2 + 4 H2O
Alternative methods have been heavily investigated, but the older literature can be unreliable.
Chloroplatinic acid was popularized for the determination of potassium. The potassium is selectively precipitated as potassium chloroplatinate. Determinations were done in 85% (v/v) alcohol solutions with excess platinate ions, and the precipitated product was weighed. Potassium could be detected for solutions as dilute as 0.02 to 0.2% (m/v).
This method for determination of potassium was advantageous vs. the cobaltinitrite method used previously, since it required a single precipitation reaction. Today, the concentration of potassium is determined with an ion-selective electrode. These modern methods remain subject to interference.
Like many platinum compounds, chloroplatinic acid is used in catalysis. This compound was first reported by John Speier and colleagues from Dow Corning Corporation
to catalyze the reaction of silyl hydrides with olefins, hydrosilylation.(3) Typical of his reactions, Speier used isopropanol solutions containing trichlorosilane (SiHCl3
), and methyldichlorosilane (CH3
), with pentenes. Prior work on the addition of silanes to alkenes required radical reactions that were inefficient. It is generally agreed that chloroplatinic acid is a catalyst precursor, and more recent discussions have considered a possible role for colloidal platinum or zero-valent complexes.
Chloroplatinic acid prepared from aqua regia
is occasionally contaminated with (NO)2
. This species is obtained by the reaction of nitrosyl chloride
and Pt metal.
- A. E. Schweizer, G. T. Kerr (1978). "Thermal Decomposition of Hexachloroplatinic Acid". Inorg. Chem. 17 (8): 2326–2327.
- Holleman, Wiberg (2001). Inorganic Chemistry. First Edition, New York: Academic Press.