Neptunium(III) chloride

Last updated


Neptunium(III) chloride
UCl3 without caption.png
IUPAC name
Neptunium(III) chloride
Other names
Neptunium trichloride
3D model (JSmol)
PubChem CID
  • InChI=1S/3ClH.Np/h3*1H;/q;;;+3/p-3
  • Cl[Np](Cl)Cl
  • [Cl-].[Np+3].[Cl-].[Cl-]
Molar mass 343.41 g/mol
Appearancegreen solid [1]
Density 5.58g/cm3
Melting point 800 °C (1,470 °F; 1,070 K) [2] [1]
Related compounds
Other anions
Neptunium(III) fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Neptunium(III) chloride or neptunium trichloride is an inorganic compound with a chemical formula NpCl3. This salt is strongly radioactive.


Neptunium(III) chloride can be produced by reducing neptunium(IV) chloride by ammonia or hydrogen at 350~400 °C: [1]

Chemical properties

Neptunium(III) chloride hydrolyzes at 450 °C and forms an oxychloride NpOCl. [1]

Related Research Articles

Neptunium Chemical element, symbol Np and atomic number 93

Neptunium is a chemical element with the symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. Its position in the periodic table just after uranium, named after the planet Uranus, led to it being named after Neptune, the next planet beyond Uranus. A neptunium atom has 93 protons and 93 electrons, of which seven are valence electrons. Neptunium metal is silvery and tarnishes when exposed to air. The element occurs in three allotropic forms and it normally exhibits five oxidation states, ranging from +3 to +7. It is radioactive, poisonous, pyrophoric, and capable of accumulating in bones, which makes the handling of neptunium dangerous.

Iron(III) chloride Inorganic compound

Iron(III) chloride is the inorganic compound with the formula. Also called ferric chloride, it is a common compound of iron in the +3 oxidation state. The anhydrous compound is a crystalline solid with a melting point of 307.6 °C. The color depends on the viewing angle: by reflected light the crystals appear dark green, but by transmitted light they appear purple-red.

Samarium(III) chloride Chemical compound

Samarium(III) chloride, also known as samarium trichloride, is an inorganic compound of samarium and chloride. It is a pale yellow salt that rapidly absorbs water to form a hexahydrate, SmCl3.6H2O. The compound has few practical applications but is used in laboratories for research on new compounds of samarium.

Dysprosium(III) chloride Chemical compound

Dysprosium(III) chloride (DyCl3), also known as dysprosium trichloride, is a compound of dysprosium and chlorine. It is a white to yellow solid which rapidly absorbs water on exposure to moist air to form a hexahydrate, DyCl3·6H2O. Simple rapid heating of the hydrate causes partial hydrolysis to an oxychloride, DyOCl.

Chromium(III) chloride Chemical compound

Chromium(III) chloride (also called chromic chloride) describes any of several compounds with the formula CrCl3 · xH2O, where x can be 0, 5, and 6. The anhydrous compound with the formula CrCl3 is a violet solid. The most common form of the trichloride is the dark green hexahydrate, CrCl3 · 6 H2O. Chromium chlorides find use as catalysts and as precursors to dyes for wool.

Gold(III) chloride Chemical compound

Gold(III) chloride, traditionally called auric chloride, is a compound of gold and chlorine with the molecular formula Au2Cl6. The "III" in the name indicates that the gold has an oxidation state of +3, typical for many gold compounds. Gold(III) chloride is hygroscopic and decomposes in visible light. This compound is a dimer of AuCl3. This compound has few uses, although it catalyzes various organic reactions.

Erbium(III) chloride Chemical compound

Erbium(III) chloride is a violet solid with the formula ErCl3. It is used in the preparation of erbium metal.

Gadolinium(III) chloride Chemical compound

Gadolinium(III) chloride, also known as gadolinium trichloride, is GdCl3. It is a colorless, hygroscopic, water-soluble solid. The hexahydrate GdCl3∙6H2O is commonly encountered and is sometimes also called gadolinium trichloride. Gd3+ species are of special interest because the ion has the maximum number of unpaired spins possible, at least for known elements. With seven valence electrons and seven available f-orbitals, all seven electrons are unpaired and symmetrically arranged around the metal. The high magnetism and high symmetry combine to make Gd3+ a useful component in NMR spectroscopy and MRI.

Chromium(II) chloride Chemical compound

Chromium(II) chloride describes inorganic compounds with the formula CrCl2(H2O)n. The anhydrous solid is white when pure, however commercial samples are often grey or green; it is hygroscopic and readily dissolves in water to give bright blue air-sensitive solutions of the tetrahydrate Cr(H2O)4Cl2. Chromium(II) chloride has no commercial uses but is used on a laboratory-scale for the synthesis of other chromium complexes.

Arsenic trichloride Chemical compound

Arsenic trichloride is an inorganic compound with the formula AsCl3, also known as arsenous chloride or butter of arsenic. This poisonous oil is colourless, although impure samples may appear yellow. It is an intermediate in the manufacture of organoarsenic compounds.

Neptunocene Chemical compound

Neptunocene, Np(C8H8)2, is an organoneptunium compound composed of a neptunium atom sandwiched between two cyclooctatetraenide (COT2-) rings. As a solid it has a dark brown/red colour but it appears yellow when dissolved in chlorocarbons, in which it is sparingly soluble. The compound is quite air-sensitive.

Cobalt(III) chloride or cobaltic chloride is an unstable and elusive compound of cobalt and chlorine with formula CoCl
. In this compound, the cobalt atoms have a formal charge of +3.

Dysprosium(III) fluoride is an inorganic compound of dysprosium with a chemical formula DyF3.

Gadolinium(III) fluoride is an inorganic compound with a chemical formula GdF3.

Scandium perchlorate Chemical compound

Scandium perchlorate is an inorganic compound with the chemical formula Sc(ClO4)3.

Thulium(II) chloride is an inorganic compound with the chemical formula TmCl2.

Lutetium(III) hydroxide is an inorganic compound with the chemical formula Lu(OH)3.

Neptunium (IV) oxalate is an inorganic compound, a salt of neptunium and oxalic acid with the chemical formula Np(C2O4)2. The compound is slightly soluble in water, forms crystalline hydrates—green crystals.

Neptunium silicide is a binary inorganic compound of neptunium and silicon with the chemical formula NpSi
. The compound forms crystals and does not dissolve in water.


  1. 1 2 3 4 《无机化学丛书》.第十卷 锕系 锕系后元素. 张青莲 等. 科学出版社. 8.3.2 镎的卤化物. 2.氯化物 . P160. ISBN   978-7-03-030572-5
  2. Arnold F. Holleman, Nils Wiberg: Lehrbuch der Anorganischen Chemie, 102. Auflage, de Gruyter, Berlin 2007, ISBN   978-3-11-017770-1, S. 1969.