Protactinium(IV) chloride

Protactinium(IV) chloride
Names

IUPAC name Protactinium(IV) chloride
Identifiers
CAS Number	13867-41-9^Y
3D model (JSmol)	Interactive image
InChI InChI=1S/4ClH.Pa/h4*1H;/q;;;;+4/p-4 Key: YVRMMEYNJWFJEX-UHFFFAOYSA-J
SMILES [Pa](Cl)(Cl)(Cl)Cl
Properties
Chemical formula	PaCl₄
Molar mass	372.848 g mol⁻¹
Appearance	chartreuse
Density	4.72 g/cm³
Structure
Crystal structure	tetragonal^[1]，tI20
Space group	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). Infobox references

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^[1] of the tetragonal crystal system.

Preparation

Protactinium(IV) chloride can be prepared by the reduction of protactinium(V) chloride:^[2]

{\ce {2 PaCl5 + H2 -> 2 PaCl4 + 2 HCl}}

{\ce {3 PaCl5 + Al -> 3 PaCl4 + AlCl3}}

It can also be obtained by the chlorination of protactinium(IV) oxide:^[2]

{\ce {PaO2 + 2 CCl4 -> PaCl4 + 2 COCl2}}

It can also be formed during the thermal decomposition of protactinium oxychloride at 500 °C in a vacuum:^[3]

{\ce {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^[2] of the uranium(IV) chloride type.^[4]

References

^ ^a ^b 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)
^ ^a ^b ^c 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.
^ Harry Julius Emeleus, A. G. Sharpe (1970), ADVANCES IN INORGANIC CHEMISTRY AND RADIOCHEMISTRY (in German), Academic Press, p. 15, ISBN 978-0-08057861-3
^ Lester R. Morss, Norman M. Edelstein, J. Fuger (Hrsg.): . Bände 1-6. Springer, Dordrecht 2010, ISBN 978-94-007-0211-0, S. 201 (English, [1] in Google Books).

v t e Protactinium compounds
Pa(II)	PaO
Pa(III)	PaH₃ PaN
Pa(IV)	PaO₂ PaCl₄ PaBr₄ PaF₄ PaI₄ PaOCl₂ PaC Pa(C₈H₈)₂
Pa(V)	Pa₂O₅ PaF₅ PaCl₅ PaBr₅ PaI₅ PaO₂F PaO₂Cl PaO₂I PaO(NO₃)₃

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