Curium(III) bromide explained

Curium(III) bromide is the bromide salt of curium. It has an orthorhombic crystal structure.

Preparation

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

It can also be produced by reacting curium(III) oxide and hydrobromic acid at 600 °C.^[1]

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.^[2] Its crystal structure is isostructural with plutonium(III) bromide.

Notes and References

1. 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 . en . 37 . 3 . 743–749 . 10.1016/0022-1902(75)80532-X.
2. Asprey . 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 . en . 4 . 7 . 985–986 . 10.1021/ic50029a013 . 0020-1669.