Protactinium tetraiodide
Chemical compound
From Wikipedia, the free encyclopedia
Protactinium tetraiodide is a binary inorganic compound of protactinium metal and iodine with the chemical formula PaI4.[1][2]
| Identifiers | |
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3D model (JSmol) |
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| Properties | |
| I4Pa | |
| Molar mass | 738.65376 g·mol−1 |
| Appearance | black crystals |
| Related compounds | |
Related compounds |
uranium tetraiodide, thorium tetraiodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis
Protactinium tetraiodide can be prepared by reducing the pentaiodide with aluminum at about 400 °C:[3]
- 3PaI5 + Al → 3PaI4 + AlI3
Also, a reaction of hydrogen reduction of protactinium(V) iodide at 400 °C:[4]
- 2PaI5 + H2 → 2PaI4 + 2HI
Physical properties
Chemical properties
The compound is oxidized by antimony trioxide when heated in a vacuum:[6]
- 3PaI4 + Sb2O3 → 3PaOI2 + 2SbI3
The compound also reacts with quartz when heated:[dubious – discuss]
- 2PaI4 + SiO2 → 2PaOI2 + SiI4