Promethium(III) iodide

Promethium(III) iodide is an inorganic compound, with the chemical formula of PmI₃. It is a red radioactive solid with a melting point of 695 °C.^[1]

Promethium(III) iodide

Names
Other names Promethium iodide Promethium triiodide
Identifiers
CAS Number	13818-73-0 Y
3D model (JSmol)	Interactive image
PubChem CID	129629045
InChI InChI=1S/3HI.Pm/h3*1H;/q;;;+3/p-3 Key: CCGSLKOPQLRTPK-UHFFFAOYSA-K
SMILES [I-].[I-].[I-].[Pm+3]
Properties
Chemical formula	PmI3
Appearance	red solid[1]
Melting point	695 °C[1]
Related compounds
Other anions	promethium(III) fluoride promethium(III) chloride promethium(III) bromide
Other cations	neodymium(III) iodide samarium(III) iodide
Related compounds	promethium diiodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Promethium(III) iodide is obtained by reacting anhydrous hydrogen iodide and promethium(III) chloride at a high temperature:

PmCl₃ + 3 HI → PmI₃ + 3 HCl^[2]

From the reaction of a HI-H₂ mixture and promethium oxide (Pm₂O₃), promethium(III) iodide cannot be produced, and only promethium oxyiodide (PmOI) can be obtained. Promethium oxide reacts with molten aluminum iodide at 500 °C to form promethium iodide.^[3][4]