| Names | |
|---|---|
| IUPAC name Phosphorus(V) iodide | |
Other names
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| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
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| |
| Properties | |
| PI5 | |
| Molar mass | 665.49611 g·mol−1 |
| Appearance | Brown-black crystalline solid (disputed)[1] |
| Melting point | 41 °C (106 °F; 314 K) (disputed)[1] |
| Related compounds | |
Related compounds | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Phosphorus pentaiodide is a hypotheticalinorganic compound with formulaPI5. The existence of this compound has been claimed intermittently since the early 1900s.[2] The claim is disputed: "The pentaiodide does not exist (except perhaps asPI3·I2, but certainly not as[PI4]+I−...)".[3]
Phosphorus pentaiodide was reported to be a brown-black crystalline solid, melting at 41 °C, produced by the reaction oflithium iodide andphosphorus pentachloride inmethyl iodide, however, this claim is disputed and probably generated a mixture ofphosphorus triiodide andiodine.[1][4]
Although phosphorus pentaiodide has been claimed to exist in the form of[PI4]+I− (tetraiodophosphonium iodide), experimental and theoretical data refutes this claim.[5][1]
Unlike the elusivePI5, the[PI4]+ cation (tetraiodophosphonium cation) is widely known. This cation is known to producesalts with the anionstetraiodoaluminate[AlI4]−,hexafluoroarsenate[AsF6]−,hexafluoroantimonate[SbF6]− and tetraiodogallate[GaI4]−.[4][5]
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