Neptunium(III) bromide

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

Preparation

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

Properties

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

Reactions

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

External reading

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