Protactinium(IV) chloride

Protactinium(IV) chloride
Names
IUPAC name
Protactinium(IV) chloride
Identifiers
3D model (JSmol)
  • InChI=1S/4ClH.Pa/h4*1H;/q;;;;+4/p-4
    Key: YVRMMEYNJWFJEX-UHFFFAOYSA-J
  • [Pa](Cl)(Cl)(Cl)Cl
Properties
PaCl4
Molar mass 372.848 g mol−1
Appearance chartreuse
Density 4.72 g/cm3
Structure
tetragonal，tI20
I41/amd , No. 141
Related compounds
Other anions
 Protactinium(IV) fluoride
Protactinium(IV) bromide
Protactinium(IV) iodide
Other cations
 Uranium(IV) chloride
Thorium(IV) chloride
Praseodymium(III) chloride
Related compounds
 Protactinium(V) chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Protactinium(IV) chloride is an inorganic compound. It is an actinide halide, a salt composed of protactinium and chlorine. It is radioactive, and has the chemical formula of PaCl4. It is a chartreuse-coloured (yellowish-green) crystal of the tetragonal crystal system.

Preparation

Protactinium(IV) chloride can be prepared by the reduction of protactinium(V) chloride:

2 PaCl5 + H2 → 2 PaCl4 + 2 HCl
3 PaCl5 + Al → 3 PaCl4 + AlCl3

It can also be obtained by the chlorination of protactinium(IV) oxide:

PaO2 + 2 CCl4 → PaCl4 + 2 COCl2

It can also be formed during the thermal decomposition of protactinium oxychloride at 500 °C in a vacuum:

2 PaOCl2 → PaCl4 + PaO2

Properties

Protactinium(IV) chloride is a chartreuse, hygroscopic, crystalline solid that can be sublimed at 400 °C in a vacuum. It is soluble in strong mineral acids, forming green solutions. The complex PaCl4·4CH3CN is formed with acetonitrile. It has a tetragonal crystal structure with the space group I41/amd (space group no. 141) and the lattice parameters a = 837.7 pm, c = 747.9 pm of the uranium(IV) chloride type.

References

  1. 1 2 Brown D., Hall T.L., Moseley P.T (1973). "Structural parameters and unit cell dimensions for the tetragonal actinide tetrachlorides(Th, Pa, U, and Np) and tetrabromides (Th and Pa)". J. Chem. Soc., Dalton Trans. (6): 686–691. doi:10.1039/DT9730000686.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  2. 1 2 3 Georg Brauer (Hrsg.), unter Mitarbeit von Marianne Baudler u. a.: Handbuch der Präparativen Anorganischen Chemie. 3., umgearbeitete Auflage. Band I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6, pp. 1176.
  3. ↑ Harry Julius Emeleus, A. G. Sharpe (1970), ADVANCES IN INORGANIC CHEMISTRY AND RADIOCHEMISTRY (in German), Academic Press, p. 15, ISBN 978-0-08057861-3
  4. ↑ Lester R. Morss, Norman M. Edelstein, J. Fuger (Hrsg.): . Bände 1-6. Springer, Dordrecht 2010, ISBN 978-94-007-0211-0, S. 201 (English, in Google Books).