Neptunium(IV) bromide

Neptunium tetrabromide
Names
	Other names neptunium(IV) bromide
Identifiers
CAS Number	15608-32-9 ;
Properties
Chemical formula	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
Related compounds	Uranium tetrabromide, Thorium tetrabromide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

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 + 2Al₂O₃

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 + Sb₂O₃ → 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.
^ 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. 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.

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[1] "WebElements Periodic Table » Neptunium » neptunium tetrabromide". webelements.com. Retrieved 2 April 2024.

[2] 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.

[3] 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.

[4] 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.

[5] Fried, S. (1947). The Basic Dry Chemistry of Neptunium. Atomic Energy Commission. p. 10. Retrieved 2 April 2024.

[6] Abstracts of Declassified Documents. Technical Information Division, Oak Ridge Directed Operations. 1947. p. 740. Retrieved 2 April 2024.

[7] 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. Retrieved 2 April 2024.

[8] 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.

[9] The Chemical Thermodynamics of Actinide Elements and Compounds: The actinide halides. International Atomic Energy Agency. 1983. p. 162. Retrieved 2 April 2024.

[10] Satya, Prakash (2013). Advanced Chemistry of Rare Elements. S. Chand Publishing. p. 684. ISBN 978-81-219-4254-6. Retrieved 2 April 2024.

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v t e Bromine compounds
Br(−I)	Br⁻ CH₃Br CH₂Br₂ CHBr₃ CBr₄ HBr C₃H₅Br
Br(−I,I)	Br₃⁻
Br(I)	BrCl BrF BrN₃ BrNO₃ Br₂O BrO⁻ NBr₃
Br(II)	BrO
Br(I,V)	Br₂O₃
Br(III)	BrF₃ BrO₂⁻
Br(IV)	BrO₂
Br(V)	BrF₅ Br₂O₅ BrO₃⁻ BrOF₃ BrO₂F
Br(VII)	BrO₄⁻ BrO₃F