Uranium borohydride

Uranium borohydride

Chembox new
Name = Uranium borohydride
ImageFile = Uranium borohydride.jpg
ImageName = Uranium borohydride
OtherNames =
Section1 = Chembox Identifiers
CASNo =
Section2 = Chembox Properties
Formula = U(BH4)4
MolarMass = 297.27 g/mol
Density =
Solvent = other solvents
SolubleOther = Decomposes
MeltingPt =
BoilingPt =

Uranium borohydride U(BH4)4 is a volatile uranium compound with boron. It is a tetrahedral monomer in its gas phase and has a vapor pressure of 4 mmHg at 60 °C.

During the Manhattan Project the need arose to find volatile compounds of uranium suitable for use in the diffusion separation of uranium isotopes. Uranium borohydride is, after uranium hexafluoride, the most volatile compound of uranium known. Uranium hexafluoride presented serious handling difficulties, causing the managers to seek alternatives. When the synthesis problems had been sufficiently defined it was decided to evaluate a boron compound. Enrico Fermi's purported comment when he observed the neutron cross section for boron—"My God! It's as big as the side of a barn!"—not only gave a name to the unit of cross section (barns), it also put an end to using uranium borohydride in the diffusion process.

References


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Borohydride — A borohydride is a salt of the tetrahydridoborate(III) ion, BH4−. Some important borohydrides are:* Lithium borohydride * Sodium borohydride * Uranium borohydride …   Wikipedia

  • Borane — In chemistry, a borane is a chemical compound of boron and hydrogen. The boranes comprise a large group of compounds with the generic formulae of BxHy. These compounds do not occur in nature. Many of the boranes readily oxidise on contact with… …   Wikipedia

  • Organouranium chemistry — Uranocene Organouranium chemistry is the science exploring the properties, structure and reactivity of organouranium compounds, which are organometallic compounds containing a carbon to uranium chemical bond.[1] The field is of some importance to …   Wikipedia

  • Tm ligands — The TmMe Ligand was first reported by Reglinski and Spicer ( J. Chem. Soc. Chem. Commun. , 1996, 1975) and was prepared by reacting Methimazole (1 methylimidazole 2 thione) with sodium borohydride in a solvent free melt. Both lithium and… …   Wikipedia

  • Borane — Traduction à relire Borane → Borane (+) …   Wikipédia en Français

  • hydride — /huy druyd, drid/, n. a binary compound formed by hydrogen and another, usually more electropositive, element or group, as sodium hydride, NaH, or methyl hydride, CH4. [1840 50; HYDR 2 + IDE] * * * Inorganic compound of hydrogen with another… …   Universalium

  • Energy density — For energy density in the sense of energy per unit mass, see specific energy. For energy density of foods, see specific energy. Energy density is a term used for the amount of energy stored in a given system or region of space per unit volume.… …   Wikipedia

  • Dictionary of chemical formulas — This is a list of chemical compounds with chemical formulas and CAS numbers, indexed by formula. This complements alternative listings to be found at list of inorganic compounds, list of organic compounds and inorganic compounds by element. Table …   Wikipedia

  • coordination compound — Chem. complex (def. 10). Also called coordination complex. * * * ▪ chemistry Introduction  any of a class of substances with chemical structures in which a central metal atom is surrounded by nonmetal atoms or groups of atoms, called ligands… …   Universalium

  • borane — /bawr ayn, bohr /, n. Chem. any of the compounds, both neutral and anionic, of boron and hydrogen with formulas ranging from B2H6 to B20H16. Also called boron hydride. [ < G Boran (1916); see BORON, ANE] * * * ▪ chemical compound Introduction… …   Universalium

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”