Aluminium bromide

Aluminium bromide
Names
	Preferred IUPAC name Aluminium bromide
	Other names Aluminic bromide; Aluminium(III) bromide; Aluminium tribromide;
Identifiers
CAS Number	7727-15-3 ; 7784-11-4 hexahydrate ;
3D model (JSmol)	monomer: Interactive image; dimer: Interactive image; hexahydrate: Interactive image;
ChemSpider	22818 ; 9040513 hemi(acetyl bromide) ; 9499890 ethanethiol ;
ECHA InfoCard	100.028.891
EC Number	231-779-7;
PubChem CID	24409; 11062022 tertikis(tetrachloromethane); 10865226 hemi(acetyl bromide); 11324936 ethanethiol; 6093832 tris(pyridine);
RTECS number	BD0350000;
UNII	IY20HBK5LK ;
UN number	1725
CompTox Dashboard (EPA)	DTXSID2064783 ;
	InChI InChI=1S/Al.3BrH/h;31H/q+3;;;/p-3 Key: PQLAYKMGZDUDLQ-UHFFFAOYSA-K ; InChI=1/Al.3BrH/h;31H/q+3;;;/p-3 Key: PQLAYKMGZDUDLQ-DFZHHIFOAT;
	SMILES monomer: Br[Al](Br)Br; dimer: Br[Al-]1(Br)[Br+][Al-]([Br+]1)(Br)Br; hexahydrate: [OH2+][Al-3]([OH2+])([OH2+])([OH2+])([OH2+])[OH2+].[Br-].[Br-].[Br-];
Properties
Chemical formula	AlBr3; Al2Br6; AlBr3·6H2O (hexahydrate)
Molar mass	266.694 g/mol (anhydrous); 374.785 g/mol (hexahydrate)
Appearance	white to pale yellow powder
Odor	pungent
Density	3.2 g/cm3 (anhydrous); 2.54 g/cm3 (hexahydrate)
Melting point	97.5 °C (anhydrous); 93 °C (hexahydrate)
Boiling point	255 °C (anhydrous)
Solubility in water	very soluble, partially hydrolyses indicated by a fuming solution and an optional appearance of white precipitate
Solubility	slightly soluble in methanol, diethyl ether, acetone
Structure
Crystal structure	Monoclinic, mP16 (anhydrous)
Space group	P21/c, No. 14
Lattice constant	a = 0.7512 nm, b = 0.7091 nm, c = 1.0289 nm α = 90°, β = 96.44°, γ = 90°
Formula units (Z)	4
Thermochemistry
Heat capacity (C)	100.6 J/(mol·K)
Std molar; entropy (S⦵298)	180.2 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	−572.5 kJ/mol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H314
Precautionary statements	P260, P264, P270, P280, P301+P312, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P330, P363, P405, P501
NFPA 704 (fire diamond)	3 1 1
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	1598 mg/kg (oral, rat)
Related compounds
Other anions	aluminium trichloride; aluminium triiodide
Other cations	boron tribromide
Related compounds	iron(III) bromide
	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

Aluminium bromide is any chemical compound with the empirical formula AlBr_x. Aluminium tribromide is the most common form of aluminium bromide. It is a colorless, sublimable hygroscopic solid; hence old samples tend to be hydrated, mostly as aluminium tribromide hexahydrate (AlBr₃·6H₂O).