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Platinum(IV) chloride - Wikipedia, the free encyclopedia

Platinum(IV) chloride

From Wikipedia, the free encyclopedia

Platinum(IV) chloride
Image:Platinum(IV) chloride.jpg
General
Other names
Molecular formula PtCl4
Molar mass 336.89 g/mol
Appearance brown powder
CAS number [13454-96-1]
Properties
Density and phase 4.303 g/cm3, solid
Solubility in aq HCl to give H2PtCl6
Melting point 370 °C, decomposes
Boiling point decompose
Hazards
EU classification not listed
NFPA 704
Related compounds
Related compounds PtCl2
H2PtCl6
K2PtCl6
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Platinum(IV) chloride is the chemical compound with the empirical formula PtCl4. This brown solid features platinum in the 4+ oxidation state. Typical of Pt(IV), the metal centers adopt the octahedral geometry. This geometry is achieved by forming a polymer wherein half of the chloride ligands bridge between the platinum atoms. Because of its polymeric structure, PtCl4 dissolves only upon breaking the chloride bridges. Thus, addition of HCl give H2PtCl6. Lewis base adducts of Pt(IV) of the type cis-PtCl4L2 are known but most are prepared by oxidation of the Pt(II) derivatives.

PtCl4 is mainly encountered in the handling of chloroplatinic acid, a soluble form of platinum obtained upon dissolution of Pt metal in aqua regia. Heating H2PtCl6 gives PtCl4 which then loses chlorine to give PtCl2.

The heavier halides, PtBr4 and PtI4, are also known.

[edit] References

Cotton, S. A. Chemistry of Precious Metals, Chapman and Hall (London): 1997. ISBN 0-7514-0413-6.

[edit] External links


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