Neptunium tetrabromide |
| Names |
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| Other names neptunium(IV) bromide |
| Identifiers |
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InChI=1S/4BrH.Np/h4*1H;/q;;;;+4/p-4 Key: HUNTZSUKDFZQIP-UHFFFAOYSA-J
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| Properties |
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| Br4Np |
| Molar mass | 557 g·mol−1 |
| Appearance | red-brown crystals |
| Density | 5.5 g/cm3 |
| Melting point | 464 °C (867 °F; 737 K) |
| Related compounds |
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Related compounds | Uranium tetrabromide,Thorium tetrabromide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). |
Chemical compound
Neptunium tetrabromide is a binaryinorganic compound ofneptunium metal andbromine with the chemical formulaNpBr4.[1][2][3][4]
The compound can be prepared from the reaction of bromine with metallic neptunium:
- Np + 2Br2 → NpBr4
Also, a reaction of aluminum bromide withneptunium(IV) oxide:[5][6]
- 3NpO2 + 4AlBr3 → 3NpBr4 + 2Al2O3
Physical properties
[edit]Neptunium tetrabromide forms red-brown hygroscopic crystals ofmonoclinic crystal system, spatial groupP 2/c,[7][8] cell parameters a = 1.089 nm, b = 0.874 nm, c = 0.705 nm, β = 95.19°, Z = 4.[9]
NpBr4 is easily purified by sublimation in a vacuum.[10]
Chemical properties
[edit]Decomposes under strong heating to formneptunium tribromide:
- 2NpBr4 → 2NpBr3 + Br2
With careful oxidation withantimony(III) oxide, the compound forms neptunium oxidibromide:
- NpBr4 + Sb2O3 → NpOBr2 + 2SbOBr
- ^"WebElements Periodic Table » Neptunium » neptunium tetrabromide". webelements.com. Retrieved2 April 2024.
- ^Stevens, J. L.; Jones, E. R.; Karraker, D. G. (15 February 1976)."Mössbauer spectra and magnetic susceptibility of neptunium tetrabromide".The Journal of Chemical Physics.64 (4):1492–1494.Bibcode:1976JChPh..64.1492S.doi:10.1063/1.432366. Retrieved2 April 2024.
- ^Brown, D.; Hill, J.; Rickard, C. E. F. (1 January 1970)."Preparation of actinide bromides and bromo-complexes by use of liquid boron tribromide or liquid bromine".Journal of the Chemical Society A: Inorganic, Physical, Theoretical:476–480.doi:10.1039/J19700000476.ISSN 0022-4944. Retrieved2 April 2024.
- ^Yaws, Carl L. (6 January 2015).The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals: Physical Properties for More Than 54,000 Organic and Inorganic Chemical Compounds, Coverage for C1 to C100 Organics and Ac to Zr Inorganics.Gulf Professional Publishing. p. 740.ISBN 978-0-12-801146-1. Retrieved2 April 2024.
- ^Fried, S. (1947).The Basic Dry Chemistry of Neptunium. Atomic Energy Commission. p. 10. Retrieved2 April 2024.
- ^Abstracts of Declassified Documents. Technical Information Division, Oak Ridge Directed Operations. 1947. p. 740. Retrieved2 April 2024.
- ^Morss, L. R.; Edelstein, Norman M.; Fuger, Jean (21 October 2010).The Chemistry of the Actinide and Transactinide Elements (Set Vol.1-6): Volumes 1-6.Springer Science & Business Media. p. 2416.ISBN 978-94-007-0211-0. Retrieved2 April 2024.
- ^Kirk-Othmer Concise Encyclopedia of Chemical Technology, 2 Volume Set.John Wiley & Sons. 16 July 2007. p. 47.ISBN 978-0-470-04748-4. Retrieved2 April 2024.
- ^The Chemical Thermodynamics of Actinide Elements and Compounds: The actinide halides. International Atomic Energy Agency. 1983. p. 162. Retrieved2 April 2024.
- ^Satya, Prakash (2013).Advanced Chemistry of Rare Elements. S. Chand Publishing. p. 684.ISBN 978-81-219-4254-6. Retrieved2 April 2024.
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| Np(II) | |
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| Np(III) | |
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| Np(III,IV) | |
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| Np(IV) | |
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| Np(V) | |
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| Np(V,VI) | |
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| Np(VI) | |
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| Np(VII) | |
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| Br(−I) | |
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| Br(−I,I) | |
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| Br(I) | |
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| Br(II) | |
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| Br(I,V) | |
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| Br(III) | |
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| Br(IV) | |
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| Br(V) | |
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| Br(VII) | |
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