Polonium tetraiodide

Polonium tetraiodide is a binary inorganic compound of polonium and iodine with the chemical formula PoI
₄.^[3][4] The compound forms volatile black crystals. ^[5]

Polonium tetraiodide

Names
Other names Polonium(IV) iodide
Identifiers
CAS Number	61716-27-6
3D model (JSmol)	Interactive image
InChI InChI=1S/4HI.Po/h4*1H;/q;;;;+4/p-4 Key: DHKHYWWHNZXEQM-UHFFFAOYSA-J
SMILES I[Po](I)(I)I
Properties
Chemical formula	PoI 4[1]
Molar mass	716.6 g/mol
Appearance	Black crystals
Melting point	200 °C (392 °F; 473 K)
Solubility in water	Insoluble[2]
Related compounds
Related compounds	Chromium(III) sulfide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

1. Action of iodine vapor on polonium metal:

Po + 2 I₂ → PoI₄

2. Dissolution of polonium dioxide in hydroiodic acid:^[6]

PoO₂ + 4 HI → PoI₄ + 2 H₂O

Properties

Physical properties

The compound forms black crystals that are insoluble in water.

Chemical properties

The compound reacts with hydroiodic acid to form hexaiodopolonic acid:

PoI₄ + 2 HI → H₂[PoI₆]

It can be reduced by hydrogen sulfide to yield polonium metal.^[5] It decomposes on heating.