Neptunium tetrabromide

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Neptunium tetrabromide
UBr4.png
Names
Other names
neptunium(IV) bromide
Identifiers
3D model (JSmol)
  • InChI=1S/4BrH.Np/h4*1H;/q;;;;+4/p-4
    Key: HUNTZSUKDFZQIP-UHFFFAOYSA-J
  • [Np+4].[Br-].[Br-].[Br-].[Br-]
Properties
Br4Np
Molar mass 557 g·mol−1
Appearancered-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 [77 °F], 100 kPa).

Neptunium tetrabromide is a binary inorganic compound of neptunium metal and bromine with the chemical formula NpBr4. [1] [2] [3] [4]

Contents

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

Related Research Articles

<span class="mw-page-title-main">Aluminium bromide</span> Chemical compound

Aluminium bromide is any chemical compound with the empirical formula AlBrx. Aluminium tribromide is the most common form of aluminium bromide. It is a colorless, sublimable hygroscopic solid; hence old samples tend to be hydrated, mostly as aluminium tribromide hexahydrate (AlBr3·6H2O).

<span class="mw-page-title-main">Arsenic tribromide</span> Chemical compound

Arsenic tribromide is an inorganic compound with the formula AsBr3, it is a bromide of arsenic. Arsenic is a chemical element that has the symbol As and atomic number 33. This pyramidal molecule is the only known binary arsenic bromide. AsBr3 is noteworthy for its very high refractive index of approximately 2.3. It also has a very high diamagnetic susceptibility. The compound exists as colourless deliquescent crystals that fume in moist air.

<span class="mw-page-title-main">Gold(III) bromide</span> Chemical compound

Gold(III) bromide is a dark-red to black crystalline solid. It has the empirical formula AuBr3, but exists primarily as a dimer with the molecular formula Au2Br6 in which two gold atoms are bridged by two bromine atoms. It is commonly referred to as gold(III) bromide, gold tribromide, and rarely but traditionally auric bromide, and sometimes as digold hexabromide. As is similar with the other gold halides, this compound is unique for being a coordination complex of a group 11 transition metal that is stable in an oxidation state of +3 whereas copper or silver complexes persist in oxidation states of +1 or +2.

Zirconium(IV) bromide is the inorganic compound with the formula ZrBr4. This colourless solid is the principal precursor to other Zr–Br compounds.

<span class="mw-page-title-main">Gallium(III) bromide</span> Chemical compound

Gallium(III) bromide (GaBr3) is a chemical compound, and one of four gallium trihalides.

<span class="mw-page-title-main">Terbium(III) bromide</span> Chemical compound

Terbium(III) bromide (TbBr3) is a crystalline chemical compound.

Bromine compounds are compounds containing the element bromine (Br). These compounds usually form the -1, +1, +3 and +5 oxidation states. Bromine is intermediate in reactivity between chlorine and iodine, and is one of the most reactive elements. Bond energies to bromine tend to be lower than those to chlorine but higher than those to iodine, and bromine is a weaker oxidising agent than chlorine but a stronger one than iodine. This can be seen from the standard electrode potentials of the X2/X− couples (F, +2.866 V; Cl, +1.395 V; Br, +1.087 V; I, +0.615 V; At, approximately +0.3 V). Bromination often leads to higher oxidation states than iodination but lower or equal oxidation states to chlorination. Bromine tends to react with compounds including M–M, M–H, or M–C bonds to form M–Br bonds.

<span class="mw-page-title-main">Silicon tetrabromide</span> Chemical compound

Silicon tetrabromide, also known as tetrabromosilane, is the inorganic compound with the formula SiBr4. This colorless liquid has a suffocating odor due to its tendency to hydrolyze with release of hydrogen bromide. The general properties of silicon tetrabromide closely resemble those of the more commonly used silicon tetrachloride.

<span class="mw-page-title-main">Bismuth tribromide</span> Chemical compound

Bismuth tribromide is an inorganic compound of bismuth and bromine with the chemical formula BiBr3.

Scandium bromide, or ScBr3, is a trihalide, hygroscopic, water-soluble chemical compound of scandium and bromine.

Titanium(III) bromide is the inorganic compound with the formula TiBr3. It is a blue black paramagnetic solid with a reddish reflection. It has few applications, although it is a catalyst for the polymerization of alkenes.

<span class="mw-page-title-main">Neodymium(III) bromide</span> Chemical compound

Neodymium(III) bromide is an inorganic salt of bromine and neodymium the formula NdBr3. The anhydrous compound is an off-white to pale green solid at room temperature, with an orthorhombic PuBr3-type crystal structure. The material is hygroscopic and forms a hexahydrate in water (NdBr3· 6H2O), similar to the related neodymium(III) chloride.

<span class="mw-page-title-main">Selenium tetrabromide</span> Chemical compound

Selenium tetrabromide is an inorganic compound with a chemical formula SeBr4.

Osmium tetrabromide is the inorganic compound with the formula OsBr4. A black solid, this compound can be produced by heating osmium tetrachloride and bromine under pressure.

<span class="mw-page-title-main">Dysprosium(III) bromide</span> Chemical compound

Dysprosium(III) bromide is an inorganic compound of bromine and dysprosium, with the chemical formula of DyBr3.

Neptunium compounds are compounds containg the element neptunium (Np). Neptunium has five ionic oxidation states ranging from +3 to +7 when forming chemical compounds, which can be simultaneously observed in solutions. It is the heaviest actinide that can lose all its valence electrons in a stable compound. The most stable state in solution is +5, but the valence +4 is preferred in solid neptunium compounds. Neptunium metal is very reactive. Ions of neptunium are prone to hydrolysis and formation of coordination compounds.

Osmium(III) tribromide is a binary inorganic compound with the chemical formula OsBr
3.

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

Einsteinium(II) bromide is a binary inorganic chemical compound of einsteinium and bromine with the chemical formula EsBr2.

References

  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. Bibcode:1976JChPh..64.1492S. 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 : 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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