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Chemical compound
Neptunium tetrabromide is a binary
inorganic compound of
neptunium metal and
bromine with the chemical formula NpBr4 .
[1]
[2]
[3]
[4]
Synthesis
The compound can be prepared from the reaction of bromine with metallic neptunium:
Np + 2Br2 → NpBr4
Also, a reaction of aluminum bromide with
neptunium(IV) oxide :
[5]
[6]
3NpO2 + 4AlBr3 → 3NpBr4 + 2Al2 O3
Physical properties
Neptunium tetrabromide forms red-brown hygroscopic crystals of
monoclinic crystal system , spatial group P 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
Decomposes under strong heating to form
neptunium tribromide :
2NpBr4 → 2NpBr3 + Br2
With careful oxidation with
antimony(III) oxide , the compound forms neptunium oxidibromide:
NpBr4 + Sb2 O3 → NpOBr2 + 2SbOBr
References
^
"WebElements Periodic Table » Neptunium » neptunium tetrabromide" . webelements.com. Retrieved 2 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.
doi :
10.1063/1.432366 . Retrieved 2 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 (0): 476–480.
doi :
10.1039/J19700000476 .
ISSN
0022-4944 . Retrieved 2 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 . Retrieved 2 April 2024 .
^ Fried, S. (1947).
The Basic Dry Chemistry of Neptunium . Atomic Energy Commission. p. 10. Retrieved 2 April 2024 .
^
Abstracts of Declassified Documents . Technical Information Division, Oak Ridge Directed Operations. 1947. p. 740. Retrieved 2 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 . Retrieved 2 April 2024 .
^
The Chemical Thermodynamics of Actinide Elements and Compounds: The actinide halides . International Atomic Energy Agency. 1983. p. 162. Retrieved 2 April 2024 .
^ Satya, Prakash (2013).
Advanced Chemistry of Rare Elements . S. Chand Publishing. p. 684.
ISBN
978-81-219-4254-6 . Retrieved 2 April 2024 .
Np(III) Np(IV) Organoneptunium(IV) compounds
Np(V) Np(VI) Np(VII)
Br(−I) Br(−I,I) Br(I) Br(II) Br(I,V) Br(III) Br(IV) Br(V) Br(VII)