• Source: 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:

6 NpO2 + 8 AlBr3 → 6 NpBr3 + 4 Al2O3 + 3 Br2




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

2 NpBr3 + Br2 → 2 NpBr4




References






External reading


Yoshida, Zenko; Johnson, Stephen G.; Kimura, Takaumi; Krsul, John R. (2006), Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.), "Neptunium", The Chemistry of the Actinide and Transactinide Elements, Dordrecht: Springer Netherlands, pp. 699–812, doi:10.1007/1-4020-3598-5_6, ISBN 978-1-4020-3555-5, retrieved 2023-12-23
Keller, C. (1969), "Die Chemie des Neptuniums", Anorganische Chemie, Fortschritte der Chemischen Forschung (in German), vol. 13/1, Berlin/Heidelberg: Springer-Verlag, pp. 1–124, doi:10.1007/bfb0051170, ISBN 978-3-540-04488-8, retrieved 2023-12-23

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