Americium(III) chloride or americium trichloride is the chemical compound composed of americium and chlorine with the formula AmCl3. This salt forms pink hexagonal crystals. In the solid state each americium atom has nine chlorine atoms as near neighbours, at approximately the same distance, in a tricapped trigonal prismatic configuration.
|Systematic IUPAC name
3D model (JSmol)
|Molar mass||349 g·mol−1|
|Appearance||Light red, opaque crystals|
|Density||5.87 g cm−3|
|Melting point||715 °C (1,319 °F; 988 K)|
|Boiling point||850 °C (1,560 °F; 1,120 K)|
|hexagonal (UCl3 type), hP8|
|P63/m, No. 176|
|Tricapped trigonal prismatic|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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The hexahydrate has a monocline crystal structure with: a = 970,2 pm, b = 656,7 pm and c = 800,9 pm; β = 93° 37'; space group: P2/n.
An americium(III) chloride electrorefining method has been investigated to separate mixtures of actinides, since the standard Gibbs free energy of formation of americium(III) chloride is much different than the rest of the actinide chlorides. This can be used to remove americium from plutonium by melting the crude mixture together with salts such as sodium chloride.