Potassium hexachloroplatinate

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

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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/h61H;;;/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 (K_sp)	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 Potassium hexachloropalladate(IV) Potassium hexachloroosmate
Other cations	Hexachloroplatinic acid Sodium hexachloroplatinate Ammonium hexachloroplatinate
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 has been used for the determination of potassium by gravimetric analysis.^[4] It is 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]

References

[1]
Grinberg, A. A.; Sibirskaya, V. V. (1967). "Solubility of hexammine and hexahalo platinum(IV) complexes". Zhurnal Neorganicheskoi Khimii. 12: 2069–2071.
[2]
John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–189. ISBN 978-1-138-56163-2.
[3]
"Potassium hexachloroplatinate(IV)". pubchem.ncbi.nlm.nih.gov. Retrieved 27 December 2021.
[4]
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. Bibcode:1933JAChS..55.3957S. doi:10.1021/ja01337a007.
[5]
Kauffman, George B.; Teter, Larry A.; Rhoda, Richard N. (1963). "Recovery of Platinum from Laboratory Residues". Inorganic Syntheses. Vol. 7. pp. 232–236. doi:10.1002/9780470132388.ch61.
[6]
Iovel, I. G.; Goldberg, Y. S.; Shymanska, M. V.; Lukevics, E. (1987). "Quaternary Onium Hexachloroplatinates: Novel Hydrosilylation Catalysts". Organometallics. 6 (7): 1410–1413. doi:10.1021/om00150a007.
[7]
George B. Kauffman; Dwaine A. Cowan (1963). "Cis - and trans -Dichlorodiammineplatinum(II)". cis- and trans-Dichlorodiammine Platinum(II). Inorganic Syntheses. Vol. 7. pp. 239–245. doi:10.1002/9780470132388.ch63. ISBN 978-0-470-13238-8. {{cite book}}: ISBN / Date incompatibility (help)
[8]
Keller, R. N. (1946). "Potassium Tetrachloroplatinate(II)". Inorg. Synth. 2: 247–250. doi:10.1002/9780470132333.ch79.
[9]
Curtis, Neville J.; Lawrance, Geoffrey A.; Sargeson, Alan M. (1986). "Pentaammineplatinum(IV) Complexes". Inorganic Syntheses. Vol. 24. pp. 277–279. doi:10.1002/9780470132555.ch74. ISBN 978-0-471-83441-0.
[10]
Renner, Hermann; Schlamp, Günther; Kleinwächter, Ingo; Drost, Ernst; Lüschow, Hans Martin; Tews, Peter; Panster, Peter; Diehl, Manfred; Lang, Jutta; Kreuzer, Thomas; Knödler, Alfons; Starz, Karl Anton; Dermann, Klaus; Rothaut, Josef; Drieselmann, Ralf; Peter, Catrin; Schiele, Rainer (2001). "Platinum Group Metals and Compounds". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a21_075. ISBN 3-527-30673-0.

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