Curium(III) bromide

Curium(III) bromide is the bromide salt of curium.^[1] It has an orthorhombic crystal structure.^[4]

Curium(III) bromide^[1]

Names
Other names Curium tribromide Curium bromide
Identifiers
CAS Number	14890-42-7
3D model (JSmol)	Interactive image
ChemSpider	28548255
PubChem CID	185560
InChI InChI=1S/3BrH.Cm/h3*1H;/p-3 Key: HKCWOGXVUZTSCB-UHFFFAOYSA-K
SMILES [Br-].[Br-].[Br-].[Cm]
Properties
Chemical formula	CmBr3
Molar mass	486.782 g/mol
Appearance	White or pale yellow green solid[2]
Density	6.87 g·cm−3[3]
Boiling point	625 °C (1,157 °F; 898 K)
Structure[4]
Coordination geometry	Orthorhombic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Curium bromide can be produced by reacting curium chloride and ammonium bromide in a hydrogen atmosphere at 400–450 °C.^[5]

CmCl₃ + 3NH₄Br → CmBr₃ + 3 NH₄Cl

It can also be produced by reacting curium(III) oxide and hydrobromic acid at 600 °C.^[6]

Properties

Curium bromide is an ionic compound composed of Cm³⁺ and Br⁻, appearing as a colorless solid. It is orthorhombic, with space group Cmcm (No. 63) and lattice parameters a = 405 pm, b = 1266 pm and c = 912 pm.^[5] Its crystal structure is isostructural with plutonium(III) bromide.