Phosphorus triiodide

Phosphorus triiodide
Names
	IUPAC names Phosphorus triiodide; Phosphorus(III) iodide
	Other names Triiodophosphine
Identifiers
CAS Number	13455-01-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	75323 ;
ECHA InfoCard	100.033.302
EC Number	236-647-2;
PubChem CID	83485;
UNII	82QUK78Y7Y ;
CompTox Dashboard (EPA)	DTXSID1065475 ;
	InChI InChI=1S/I3P/c1-4(2)3 Key: PZHNNJXWQYFUTD-UHFFFAOYSA-N ; InChI=1/I3P/c1-4(2)3 Key: PZHNNJXWQYFUTD-UHFFFAOYAR;
	SMILES IP(I)I;
Properties
Chemical formula	PI3
Molar mass	411.68717 g/mol
Appearance	dark red solid
Density	4.18 g/cm3
Melting point	61.2 °C (142.2 °F; 334.3 K)
Boiling point	200 °C (392 °F; 473 K) (decomposes)
Solubility in water	Decomposes
Structure
Molecular shape	Trigonal pyramidal
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314, H335
Precautionary statements	P260, P280, P301+P330+P331, P303+P361+P353, P305+P351+P338
NFPA 704 (fire diamond)	3 0 2 W
Flash point	non-flammable
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Phosphorus triiodide (PI₃) is an inorganic compound with the formula PI₃. A red solid, it is too unstable to be stored; it is, nevertheless, commercially available. It is widely used in organic chemistry for converting alcohols to alkyl iodides. It is also a powerful reducing agent. Note that phosphorus also forms a lower iodide, P₂I₄, but the existence of PI₅ is doubtful at room temperature.

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