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

Chemical compound

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

## Preparation

[edit]

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

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

## Properties

[edit]

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

[edit]

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

2 NpBr3 \+ Br2 → 2 NpBr4

## References

[edit]

1. ^ Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, p. 1969, ISBN 0-12-352651-5
2. ^ a b c d Gmelins Handbuch der anorganischen Chemie, System No. 71, Transurane, Teil C, S. 148–150.
3. ^ a b 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

[edit]

* 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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Neptunium compounds

Np(II)|

* [K(2.2.2-crypt)][NpCp'3]

Np(III)|

* NpAs
* NpAs2
* NpBr3
* NpF3
* NpCl3
* NpI3
* NpN
* NpP
* NpSi2
* NpS
* Np2S3

Np(III,IV)|

* Np3S5

Np(IV)|

* NpCl4
* NpBr4
* NpF4
* Np(NO3)4
* NpO2
* Np3P4
* NpC
* NpS2
* Np2S5
* NpS3
* Np2O2S
* Np4O4S3
* NpOS

| Organoneptunium(IV) compounds|

* Np(C2O4)2
* Np(C8H8)2

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Np(V)|

* NpF5
* Np2O5

| Neptunyl(V) compounds|

* NaNpO2CO3

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Np(VI)|

* NpF6

| Neptunyl(VI) compounds|

* NpO2CO3
* Cs4NpO2(CO3)3

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Np(VII)|

* NpO2(OH)3

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Salts and covalent derivatives of the bromide ion

| HBr |  |  |  | He

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LiBr | BeBr2 | BBr3
+BO3 | CBr4
+C | NBr3
BrN3
NH4Br
NOBr
+N | Br2O
BrO2
Br2O3
Br2O5 | BrF
BrF3
BrF5 | Ne
NaBr | MgBr2 | AlBr
AlBr3 | SiBr4 | PBr3
PBr5
PBr7
+P | S2Br2
SBr2 | BrCl | Ar
KBr | CaBr2
|  | ScBr3 | TiBr2
TiBr3
TiBr4 | VBr2
VBr3 | CrBr2
CrBr3
CrBr4 | MnBr2 | FeBr2
FeBr3 | CoBr2 | NiBr2 | CuBr
CuBr2 | ZnBr2 | GaBr3 | GeBr2
GeBr4 | AsBr3
+As
+AsO3 | SeBr2
SeBr4 | Br2 | Kr
RbBr | SrBr2 |  | YBr3 | ZrBr2
ZrBr3
ZrBr4 | NbBr5 | MoBr2
MoBr3
MoBr4 | TcBr3
TcBr4 | RuBr3 | RhBr3 | PdBr2 | AgBr | CdBr2 | InBr
InBr3 | SnBr2
SnBr4 | SbBr3
+Sb
-Sb | Te2Br
TeBr4
+Te | IBr
IBr3 | XeBr2
CsBr | BaBr2 | *  | LuBr3 | HfBr4 | TaBr5 | WBr5
WBr6 | ReBr3 | OsBr3
OsBr4 | IrBr3
IrBr
4 | PtBr2
PtBr4 | AuBr
AuBr3 | Hg2Br2
HgBr2 | TlBr | PbBr2 | BiBr3 | PoBr2
PoBr4 | AtBr | Rn
FrBr | RaBr2 | **  | Lr  | Rf  | Db  | Sg  | Bh  | Hs  | Mt  | Ds  | Rg  | Cn  | Nh  | Fl  | Mc  | Lv  | Ts  | Og

*  | LaBr3 | CeBr3 | PrBr3 | NdBr2
NdBr3 | PmBr3 | SmBr2
SmBr3 | EuBr2
EuBr3 | GdBr3 | TbBr3 | DyBr3 | HoBr3 | ErBr3 | TmBr2
TmBr3 | YbBr2
YbBr3
**  | AcBr3 | ThBr4 | PaBr4
PaBr5 | UBr3
UBr4
UBr5 | NpBr3
NpBr4 | PuBr3 | AmBr2
AmBr3 | CmBr3 | BkBr3 | CfBr3 | EsBr2
EsBr3 | Fm  | Md  | No

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Halides of actinides

|  | Ac | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm

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+6  |  |  |  | UF6
UCl6 | NpF6 | PuF6 | AmF6 | CmF6 |  |  | EsF6 |
+5  |  |  | PaF5
PaCl5
PaBr5
PaI5 | UF5
UCl5
UBr5 | NpF5 | PuF5 |  |  |  |  |  |
+4  |  | ThF4
ThCl4
ThBr4
ThI4 | PaF4
PaCl4
PaBr4
PaI4 | UF4
UCl4
UBr4
UI4 | NpF4
NpCl4
NpBr4 | PuF4 | AmF4 | CmF4 | BkF4 | CfF4 | EsF4 |
+3  | AcF3
AcCl3
AcBr3
AcI3 | ThF3
ThCl3
ThI3 |  | UF3
UCl3
UBr3
UI3 | NpF3
NpCl3
NpBr3
NpI3 | PuF3
PuCl3
PuBr3
PuI3 | AmF3
AmCl3
AmBr3
AmI3 | CmF3
CmCl3
CmBr3
CmI3 | BkF3
BkCl3
BkBr3
BkI3 | CfF3
CfCl3
CfBr3
CfI3 | EsF3
EsCl3
EsBr3
EsI3 | FmCl3
+2  |  | ThF2
ThI2
ThCl2 |  |  |  |  | AmF2
AmCl2
AmBr2
AmI2 |  |  | CfI2
CfCl2 | EsCl2
EsBr2
EsI2 | FmCl2
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