Caesium triiodide

Caesium triiodide
Identifiers
CAS Number	12297-72-2 ;
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
Melting point	77 °C (decomposes)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Caesium triiodide is an inorganic compound, with the chemical formula of CsI₃. It can be prepared by slow volatilization and crystallization of caesium iodide and iodine in aqueous ethanol solution. It can form precipitates with diazobenzene.

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