Caesium triiodide

Caesium triiodide is an inorganic compound with chemical formula Cs⁺[I₃]⁻. It can be prepared by slow volatilization and crystallization of caesium iodide and iodine in aqueous ethanol solution.^[3]

Caesium triiodide

Identifiers
CAS Number	12297-72-2 Y
3D model (JSmol)	Interactive image
ChemSpider	13753323
EC Number	625-701-4
PubChem CID	23717889
CompTox Dashboard (EPA)	DTXSID60747909
InChI InChI=1S/Cs.I3/c;1-3-2/q+1;-1 Key: PSDVEXXHXQVSQT-UHFFFAOYSA-N
SMILES I[I-]I.[Cs+]
Properties
Chemical formula	CsI3
Molar mass	513.61886 g·mol−1
Appearance	purple[1]
Melting point	77 °C (decomposes)[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

It undergoes a phase transition from Pnma to P-3c1 under high pressure, and its structure changes from layered to 3D.^[4]