Neptunium(III) bromide is a

bromide A bromide ion is the negatively charged form (Br−) of the element bromine, a member of the halogens group on the periodic table. Most bromides are colorless. Bromides have many practical roles, being found in anticonvulsants, flame-retard ...

neptunium Neptunium is a chemical element; it has chemical symbol, symbol Np and atomic number 93. A radioactivity, radioactive actinide metal, neptunium is the first transuranic element. It is named after Neptune, the planet beyond Uranus in the Solar Syste ...

, with the chemical formula of NpBr₃.

Preparation

Neptunium(III) bromide can be prepared by reacting

neptunium dioxide Neptunium(IV) oxide, or neptunium dioxide, is a radioactive, olive green cubic crystalline solid with the formula NpO2. It is one of two stable oxides of neptunium, the other being neptunium(V) oxide. It emits both α- and γ-particles. Produc ...

and

aluminium bromide Aluminium bromide is any chemical compound with the empirical formula AlBrx. Aluminium tribromide is the most common form of aluminium bromide. It is a colorless, sublimable hygroscopic solid; hence old samples tend to be hydrated, mostly as al ...

Georg Brauer Georg Karl Brauer (11 April 1908 in Bochum – 26 February 2001 in Freiburg im Breisgau Freiburg im Breisgau or simply Freiburg is the List of cities in Baden-Württemberg by population, fourth-largest city of the German state of Baden-Wü ...

(Hrsg.), unter Mitarbeit von

Marianne Baudler Marianne Baudler (27 April 1921 – 5 March 2003) was a German chemist. She is known for her research on phosphorus. Life Marianne Baudler was born in Stettin. She started studying Chemistry at the Technische Hochschule Dresden in April 1940 and ...

u. a.: ''Handbuch der Präparativen Anorganischen Chemie.'' 3., umgearbeitete Auflage. Band II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3, S. 1268. :

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. :

References

External reading

* * {{Actinide halides Neptunium(III) compounds Bromides Actinide halides