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Curium(III) bromide

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Chemical compound

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 theirstandard state (at 25 °C [77 °F], 100 kPa). Infobox references

Chemical compound

Curium(III) bromide is thebromide salt ofcurium.^[1] It has anorthorhombic crystal structure.^[4]

Preparation

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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 reactingcurium(III) oxide andhydrobromic acid at 600 °C.^[6]

Properties

[edit]

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

References

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^^a ^b"Curium tribromide".PubChem. 9 October 2021. Retrieved13 October 2021.
^Ltd, Mark Winter, University of Sheffield and WebElements."Curium Tribromide".www.webelements.com. Retrieved13 October 2021.{{cite web}}: CS1 maint: multiple names: authors list (link)
^Gmelins Handbuch der anorganischen Chemie, System Nr. 71, Transurane, Teil C, S. 149.
^^a ^bKatz, J.; Seaborg, Glenn. Morss, L; Edelstein, Norman; Fuger, Jean (eds.).The Chemistry of the Actinide and Transactinide Elements (3rd ed., Volumes 1-5). p. 1417.
^^a ^bAsprey, L. B.; Keenan, T. K.; Kruse, F. H. (Jul 1965)."Crystal Structures of the Trifluorides, Trichlorides, Tribromides, and Triiodides of Americium and Curium".Inorganic Chemistry.4 (7):985–986.doi:10.1021/ic50029a013.ISSN 0020-1669.
^Burns, John H.; Peterson, J.R.; Stevenson, J.N. (Mar 1975)."Crystallographic studies of some transuranic trihalides: 239PuCl3, 244CmBr3, 249BkBr3 and 249CfBr3".Journal of Inorganic and Nuclear Chemistry.37 (3):743–749.doi:10.1016/0022-1902(75)80532-X.