Names | |
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IUPAC name
Phosphorus(V) iodide
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Other names
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Identifiers | |
CompTox Dashboard (
EPA)
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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
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Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
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Phosphorus pentaiodide is a hypothetical inorganic compound with formula P I5. 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 as PI3·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 of lithium iodide and phosphorus pentachloride in methyl iodide, however, this claim is disputed and probably generated a mixture of phosphorus triiodide and iodine. [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 elusive PI5, the [PI4+ cation (tetraiodophosphonium cation) is widely known. This cation is known with the anions tetraiodoaluminate [AlI4−, hexafluoroarsenate [AsF6−, hexafluoroantimonate [SbF6− and tetraiodogallate [GaI4−. [4] [5]