Platinum(II) iodide

Platinum(II) iodide
	beta-PtI2 (at room temperature)
Names
	IUPAC name diiodoplatinum
	Other names Platinum diiodide, platinum(2+) diiodide
Identifiers
CAS Number	7790-39-8 ;
3D model (JSmol)	Interactive image;
ChemSpider	74229;
ECHA InfoCard	100.029.277
EC Number	232-204-2;
PubChem CID	82252;
UNII	SMK137T046;
CompTox Dashboard (EPA)	50999091;
	InChI InChI=1S/2HI.Pt/h2*1H;/q;;+2/p-2 Key: ZXDJCKVQKCNWEI-UHFFFAOYSA-L;
	SMILES [Pt+2].[I-].[I-];
Properties
Chemical formula	I2Pt
Molar mass	448.893 g·mol−1
Appearance	black crystals
Density	6.403 g/cm3
Melting point	325 °C (617 °F; 598 K) (decomposes)
Solubility in water	insoluble
Solubility	soluble in ethylamine and hydrogen iodideinsoluble in ethanol, acetone, and ether
Structure
Crystal structure	monoclinic (β-form)
Space group	P21/c (No. 14)
Lattice constant	a = 658.77 pm, b = 871.50 pm, c = 688.94 pm α = 90°, β = 102.76°, γ = 90°
Formula units (Z)	4 units per cell
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H317, H319, H335
Precautionary statements	P261, P264, P264+P265, P271, P272, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P333+P317, P337+P317, P362+P364, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Platinum(II) iodide is a binary inorganic compound of platinum and iodine with the chemical formula PtI
₂.

Structure

Platinum(II) iodide exhibits polymorphism. A cubic α-form (a = 1109 pm) and monoclinic β-form have been characterized.^[3]

Platinum(II) iodide can be produced by heating platinum(II) chloride with potassium iodide:

PtCl₂ + 2KI → PtI₂ + 2KCl

The α-form is obtained by thermal decomposition of PtI₄ in a closed ampoule at an I₂ pressure of 8 bar at 430 °C.^[3]

The β-form can be prepared by hydrothermal synthesis from PtI₄, KI, and I₂ at 420 °C.^[3]

Potassium tetraiodoplatinate (K₂PtI₄) is a soluble derivative of PtI₂.^[5]

^ ^a ^b Perry, Dale L. (2016-04-19). Handbook of Inorganic Compounds. CRC Press. p. 314. ISBN 978-1-4398-1462-8.
^ ^a ^b ^c "12170 Platinum(II) iodide, Premion®, 99.99% (metals basis), Pt 43.0% min". Alfa Aesar. Retrieved 17 April 2023.
^ ^a ^b ^c ^d Thiele, G.; Weigl, W.; Wochner, H. (August 1986). "Die Platiniodide PtI 2 und Pt 3 I 8". Zeitschrift für anorganische und allgemeine Chemie. 539 (8): 141–153. doi:10.1002/zaac.19865390813. ISSN 0044-2313.
^ PubChem. "Platinous iodide". pubchem.ncbi.nlm.nih.gov. Retrieved 2026-04-22.
^ Olsson, Lars-Fride (1989). "Dipotassium Tetraiodoplatinate(II) Dihydrate". Inorganic Syntheses. Vol. 25. pp. 98–100. doi:10.1002/9780470132562.ch21. ISBN 978-0-471-61874-4.

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