| Identifiers | |
|---|---|
| Properties | |
| I5Pa | |
| Molar mass | 865.55823 g·mol−1 |
| Appearance | black needle crystals[1] |
| Related compounds | |
Otheranions | Protactinium(V) fluoride Protactinium(V) chloride Protactinium(V) bromide |
Othercations | Praseodymium(III) iodide Thorium(IV) iodide Uranium(IV) iodide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Protactinium(V) iodide is aninorganic compound, with thechemical formula of PaI5.
It can be prepared by the reaction of metalsprotactinium andiodine, or by reactingprotactinium(V) chloride,protactinium(V) bromide orprotactinium(V) oxide withsilicon tetraiodide.[2]
It reacts withantimony trioxide in a vacuum at 150 °C to give the iodide oxides PaOI3 and PaO2I; it reacts with protactinium(V) bromide at 350 °C to obtain mixed halides PaBr3I2.[2] It reacts with the monocarbide at 600 °C to givetetraiodide.[3]
Aristid von Grosse was able to produce pure metallic protactinium with the decomposition of protactinium(V) iodide.[4][5]
When heated at 300 °C for a long time, it decomposes and iodine is released:[1]
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