Neptunium(III) bromide is a bromide of neptunium, with the chemical formula of NpBr3.
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3D model (JSmol)
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| Properties | |||
| Br3Np | |||
| Molar mass | 477 g·mol−1 | ||
| Appearance | green solid[1] | ||
| Density | 6.62 g·cm−3[2] | ||
| Structure | |||
| α-NpBr3: hexagonal β-NpBr3: orthorhombic | |||
| α-NpBr3: P63/m (No. 176) β-NpBr3: Ccmm (No. 63) | |||
a = 791.7 pm (α), 411 pm (β), b = 791.7 pm (α), 1265 pm (β), c = 438.2 pm (α), 915 pm (β)
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Other anions
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neptunium(III) fluoride neptunium(III) chloride neptunium(III) iodide | ||
Other cations
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uranium(III) bromide plutonium(III) bromide | ||
Related compounds
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neptunium(IV) bromide | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
editNeptunium(III) bromide can be prepared by reacting neptunium dioxide and aluminium bromide:[3]
- 6 NpO2 + 8 AlBr3 → 6 NpBr3 + 4 Al2O3 + 3 Br2
Properties
editNeptunium(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
editAt 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- ^ 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
- ^ a b c d Gmelins Handbuch der anorganischen Chemie, System No. 71, Transurane, Teil C, S. 148–150.
- ^ 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