Curium(III) iodide

Curium(III) iodide is the chemical compound with the formula CmI₃.^[1][2][3] Since all isotopes of curium are only artificially produced, the compound has no natural occurrence.

Curium(III) iodide

Names
Other names Curium triiodide
Identifiers
CAS Number	14696-85-6
3D model (JSmol)	Interactive image
PubChem CID	101943143 (charge error)
InChI InChI=1S/Cm.3HI/h;3*1H/q+3;;;/p-3 Key: UVXBBRRWLDYFRE-UHFFFAOYSA-K
SMILES [I-].[I-].[I-].[Cm+3]
Properties
Chemical formula	CmI3
Molar mass	628 g·mol−1
Appearance	white crystals
Related compounds
Related compounds	Americium triiodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Synthesis

Elemental curium and iodine can be reacted to synthesize curium(III) iodide.^[4]

2Cm + 3I₂ → 2CmI₃

Also by the reaction of curium(III) chloride with ammonium iodide:^[5][6]

CmCl₃ + 3NH₄I → CmI₃ + 3NH₄Cl

Physical properties

Curium(III) iodide is a colorless ionic compound consisting of Cm³⁺ and I⁻ ions. It forms white crystals the hexagonal crystal system in the space group R₃ (space group no. 148) with the lattice parameters a = 744 pm and c = 2040 pm with six units per unit cell. Its crystal structure is isotypic with that of bismuth(III) iodide.^[5][7]