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| Names | |
|---|---|
| IUPAC name Protactinium(IV) chloride | |
| Identifiers | |
3D model (JSmol) | |
| |
| |
| 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 | |
Otheranions | Protactinium(IV) fluoride Protactinium(IV) bromide Protactinium(IV) iodide |
Othercations | Uranium(IV) chloride Thorium(IV) chloride Praseodymium(III) chloride |
Related compounds | Protactinium(V) chloride |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Protactinium(IV) chloride is aninorganic compound. It is an actinide halide, a salt composed ofprotactinium andchlorine. It isradioactive, and has the chemical formula of PaCl4. It is a chartreuse-coloured (yellowish-green) crystal[1] of thetetragonal crystal system.
Protactinium(IV) chloride can be prepared by thereduction ofprotactinium(V) chloride:[2]
It can also be obtained by thechlorination ofprotactinium(IV) oxide:[2]
It can also be formed during the thermal decomposition of protactinium oxychloride at 500 °C in a vacuum:[3]
Protactinium(IV) chloride is a chartreuse,hygroscopic, crystalline solid that can be sublimed at 400 °C in a vacuum. It is soluble in strongmineral acids, forming green solutions. The complex PaCl4·4CH3CN is formed withacetonitrile. It has atetragonalcrystal structure with thespace groupI41/amd (space group no. 141) and the lattice parametersa = 837.7 pm,c = 747.9 pm[2] of theuranium(IV) chloride type.[4]
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