Neptunium(III) bromide

Neptunium(III) bromide is a bromide of neptunium, with the chemical formula of NpBr₃.

Preparation

Neptunium(III) bromide can be prepared by reacting neptunium dioxide and aluminium bromide:

Properties

Neptunium(III) bromide is a green solid. It can crystallize in two crystal systems:

• α-NpBr₃ is hexagonal with lattice parameters a = 791.7 pm and c = 438.2 pm. It has the same structure as uranium trichloride.

• β-NpBr₃ is orthorhombic with lattice parameters a = 411 pm, b = 1265 pm and c = 915 pm. It has the same structure as the bromides from plutonium to californium.

Neptunium(III) bromide also has a green hexahydrate, which is monoclinic.

Reactions

At 425 Ã‚°C, neptunium(III) bromide can be further brominated by bromine to form neptunium(IV) bromide.

References

External reading