Protactinium(IV) chloride
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| IUPAC name
Protactinium(IV) chloride
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| PaCl4 | |
| Molar mass | 372.848 g mol−1 |
| Appearance | chartreuse |
| Density | 4.72 g/cm3 |
| Structure | |
| tetragonal[1]，tI20 | |
| I41/amd , No. 141 | |
| Related compounds | |
Other anions
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Protactinium(IV) fluoride Protactinium(IV) bromide Protactinium(IV) iodide |
Other cations
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Uranium(IV) chloride Thorium(IV) chloride Praseodymium(III) chloride |
Related compounds
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Protactinium(V) chloride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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
[edit | edit source]Protactinium(IV) chloride can be prepared by the reduction of protactinium(V) chloride:[2]
- 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:[2]
- 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]
- 2 PaOCl2 → PaCl4 + PaO2
Properties
[edit | edit source]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
[edit | edit source]- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ 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, Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value)., pp. 1176.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lester R. Morss, Norman M. Edelstein, J. Fuger (Hrsg.): . Bände 1-6. Springer, Dordrecht 2010, Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value)., S. 201 (English, [1] in Google Books).