Phosphorus heptabromide

Phosphorus heptabromide
Names
	IUPAC name Tetrabromophosphanium tribromide
	Other names Perbromophosphonium tribromide; Phosphorus heptabromide; Tetrabromophosphonium tribromide;
Identifiers
CAS Number	14337-11-2 ;
3D model (JSmol)	Interactive image;
ChemSpider	57450667;
PubChem CID	71308257;
CompTox Dashboard (EPA)	DTXSID60745445;
	InChI InChI=1S/Br4P.Br3/c1-5(2,3)4;1-3-2/q+1;-1 Key: QBFSXBUUGDHSFY-UHFFFAOYSA-N;
	SMILES Br[P+](Br)(Br)Br.Br[Br-]Br;
Properties
Chemical formula	PBr; 7
Molar mass	590.302 g·mol−1
Appearance	Red prismatic crystals
Structure
Crystal structure	Orthorhombic
Space group	Pnma, No. 64
Lattice constant	a = 9.35 Å, b = 7.94 Å, c = 14.69 Å
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Phosphorus heptabromide is an inorganic compound with the chemical formula P Br
7. It is one of the phosphorus bromides. At normal conditions, it forms red prismatic crystals. PBr
7 can be prepared by the sublimation of a mixture of phosphorus pentabromide and bromine.^[2]

PBr
5 + Br
2 → PBr
7

The structure of PBr
7 consists of a tetrabromophosphonium cation [PBr
4]+
, paired with a tribromide anion [Br
3]−
, and the tribromide anion is non-symmetric.^[1]