Platinum(IV) iodide

Platinum(IV) iodide
Names
	IUPAC name tetraiodoplatinum
	Other names Platinum tetraiodide, platinic iodide, platinum(4+) tetraiodide
Identifiers
CAS Number	7790-46-7 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.029.280
EC Number	232-207-9;
PubChem CID	12978853;
CompTox Dashboard (EPA)	DTXSID30999094 ;
	InChI InChI=1S/4HI.Pt/h4*1H;/q;;;;+4/p-4 Key: RNJPWBVOCUGBGY-UHFFFAOYSA-J;
	SMILES I[Pt](I)(I)I;
Properties
Chemical formula	I4Pt
Molar mass	702.702 g·mol−1
Appearance	brown crystals
Density	6.06 g/cm3
Melting point	130 °C (266 °F; 403 K)
Solubility in water	decomposes in water
Related compounds
Related compounds	Iridium tetraiodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Platinum(IV) iodide is a inorganic compound with the formula PtI₄.^[1] A dark brown diamagnetic solid and is one of several binary iodides of platinum.

Preparation

Platinum(IV) iodide can be prepared from the effect of iodine on platinum:^[2]

Pt + 2I₂ → PtI₄

It can also be obtained from the decomposition of hydrogen hexaiodoplatinate(IV) at 80 °C:

H₂[PtI₆] → PtI₄ + 2HI

Physical properties

Platinum(IV) iodide forms dark brown crystals of several modifications:^[3]

α-PtI₄, rhombic crystal system, spatial group P bca,^[4] cell parameters a = 1.290 nm, b = 1.564 nm, c = 0.690 nm, Z = 8;

β-PtI₄, cubic crystal system, spatial group P m3m, cell parameters a = 0.56 nm, Z = 1;

γ-PtI₄, tetragonal crystal system, spatial group I 41/a, cell parameters a = 0.677 nm, c = 3.110 nm, Z = 8.

Platinum(IV) iodide decomposes in water. It is also soluble in ethanol, acetone, alkali, HI, KI, liquid NH₃.^[5]

Chemical properties

It decomposes when heated:

PtI₄ → Pt + 2I₂

When dissolved in hydroiodic acid, platinum(IV) iodide forms hydrogen hexaiodoplatinate(IV):

PtI₄ + 2HI → H₂[PtI₆]

References

^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
^ Wicks, Charles E.; Block, Frank E. (1963). Thermodynamic Properties of 65 Elements: Their Oxides, Halides, Carbides and Nitrides. U.S. Government Printing Office. p. 92. Retrieved 28 March 2024.
^ Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3510. ISBN 978-0-412-30120-9. Retrieved 28 March 2024.
^ Donnay, Joseph Désiré Hubert (1978). Crystal Data: Inorganic compounds 1967-1969. National Bureau of Standards. p. 153. Retrieved 28 March 2024.
^ "Platinum(IV) iodide, 99.95% (Metals basis), Pt 27.3% min., Thermo Scientific Chemicals, Premion | Fisher Scientific". Fisher Scientific. Retrieved 28 March 2024.

[1] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

[2] Wicks, Charles E.; Block, Frank E. (1963). Thermodynamic Properties of 65 Elements: Their Oxides, Halides, Carbides and Nitrides. U.S. Government Printing Office. p. 92. Retrieved 28 March 2024.

[3] Macintyre, Jane E. (23 July 1992). Dictionary of Inorganic Compounds. CRC Press. p. 3510. ISBN 978-0-412-30120-9. Retrieved 28 March 2024.

[4] Donnay, Joseph Désiré Hubert (1978). Crystal Data: Inorganic compounds 1967-1969. National Bureau of Standards. p. 153. Retrieved 28 March 2024.

[5] "Platinum(IV) iodide, 99.95% (Metals basis), Pt 27.3% min., Thermo Scientific Chemicals, Premion | Fisher Scientific". Fisher Scientific. Retrieved 28 March 2024.

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Platinum(IV) iodide

Preparation

Physical properties

Chemical properties

References

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