Potassium hexachloroplatinate

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Potassium hexachloroplatinate
Potassium hexachloroplatinate.png
六氯合铂(IV)酸钾 CP.jpg
3D model (JSmol)
ECHA InfoCard 100.037.239
RTECS number TP1650000
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)
0.89 g/100ml H2O (at 25 °C) [1]
Safety data sheet Oxford MSDS
Toxic (T)
Flash point 250 °C (482 °F; 523 K)
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).
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Infobox references

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(IV) 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.[2] It is also useful as an intermediate in the recovery of platinum from wastes.[3]

Potassium hexachloroplatinate may be reduced by hydrazine dihydrochloride to give the corresponding tetrachloroplatinate salt.[4][5]


  1. ^ Grinberg, A. A.; Sibirskaya, V. V. (1967). "Solubility of hexammine and hexahalo platinum(IV) complexes". Zhurnal Neorganicheskoi Khimii. 12: 2069–2071. 
  2. ^ G. F. Smith; J. L. Gring (1933). "The Separation and Determination of the Alkali Metals Using Perchloric Acid. V. Perchloric Acid and Chloroplatinic Acid in the Determination of Small Amounts of Potassium in the Presence of Large Amounts of Sodium". J. Am. Chem. Soc. 55 (10): 3957–3961. doi:10.1021/ja01337a007. 
  3. ^ George B. Kauffman, Larry A. Teter "Recovery of Platinum from Laboratory Residues" Inorganic Syntheses, 1963, volume 7, pp. 232-236. doi:10.1002/9780470132388.ch61
  4. ^ George B. Kauffman, Dwaine A. Cowan "cis- and trans-Dichlorodiammine Platinum(II)" Inorganic Syntheses, 1963, volume 7, pp. 239. doi:10.1002/9780470132388.ch63
  5. ^ Keller, R. N.; Moeller, T. (1963). "Potassium Tetrachloroplatinate(II)". Inorg. Synth. Inorganic Syntheses. 7: 247–250. doi:10.1002/9780470132333.ch79. ISBN 978-0-470-13233-3.