Neptunium(III) bromide

Neptunium(III) bromide  |  |

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Identifiers

CAS Number

* 20730-39-6

3D model (JSmol)

* Interactive image

InChI

* InChI=1S/3BrH.Np/h3*1H;/q;;;+3/p-3

Key: HVGILCLFCSGPEI-UHFFFAOYSA-K

SMILES

* [Np+3].[Br-].[Br-].[Br-]

Properties

Chemical formula

| Br3Np
Molar mass | 477 g·mol−1
Appearance  | green solid[1]
Density | 6.62 g·cm−3[2]
Structure

Crystal structure

| α-NpBr3: hexagonal

β-NpBr3: orthorhombic

Space group

| α-NpBr3: P63/m (No. 176)

β-NpBr3: Ccmm (No. 63)

Lattice constant

a = 791.7 pm (α), 411 pm (β), b = 791.7 pm (α), 1265 pm (β), c = 438.2 pm (α), 915 pm (β)

Related compounds

Other anions

| neptunium(III) fluoride
neptunium(III) chloride
neptunium(III) iodide

Other cations

| uranium(III) bromide
plutonium(III) bromide

Related compounds

| neptunium(IV) bromide

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

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

## Contents

* 1 Preparation
* 2 Properties
* 2.1 Reactions
* 3 References
* 4 External reading

## Preparation

Neptunium(III) bromide can be prepared by reacting neptunium dioxide and aluminium bromide:[3]

6 NpO
2 \+ 8 AlBr
3 → 6 NpBr
3 \+ 4 Al

3 \+ 3 Br

## 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.[2] 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.[2] It has the same structure as the bromides from plutonium to californium.

Neptunium(III) bromide also has a green hexahydrate, which is monoclinic.[3]

### Reactions

At 425 °C, neptunium(III) bromide bromide can be further brominated by bromine to form neptunium(IV) bromide.[2]

2 NpBr
3 \+ Br
2 → 2 NpBr

## References

1. ↑ Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils, ed., Inorganic Chemistry, San Diego/Berlin: Academic Press/De Gruyter, p. 1969, ISBN 0-12-352651-5
2. ↑ 2.0 2.1 2.2 2.3 Gmelins Handbuch der anorganischen Chemie, System No. 71, Transurane, Teil C, S. 148–150.
3. ↑ 3.0 3.1 Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3, S. 1268.

## External reading

* Yoshida, Zenko; Johnson, Stephen G.; Kimura, Takaumi; Krsul, John R. (2006), Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean, eds., "Neptunium" (in en), 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, http://link.springer.com/10.1007/1-4020-3598-5_6, retrieved 2023-12-23
* Keller, C. (1969), "Die Chemie des Neptuniums" (in de), Anorganische Chemie, Fortschritte der Chemischen Forschung (Berlin/Heidelberg: Springer-Verlag) 13/1: pp. 1–124, doi:10.1007/bfb0051170, ISBN 978-3-540-04488-8, http://link.springer.com/10.1007/BFb0051170, retrieved 2023-12-23

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Neptunium compounds

Np(III)|

* NpF3
* NpCl3
* NpBr3
* NpI3

Np(IV)|

* NpF4
* NpCl4
* NpBr4
* NpO2
* Np(C8H8)2

Np(V)|

* NpF5

Np(VI)|

* NpF6

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