Phosphorus pentaiodide
| Names | |
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| IUPAC name
Phosphorus(V) iodide
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Other names
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| Identifiers | |
3D model (JSmol)
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PubChemCID
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CompTox Dashboard(EPA)
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| Properties | |
| PI5 | |
| Molar mass | 665.49611g·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 theirstandard state(at 25 °C [77 °F], 100 kPa).
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Phosphorus pentaiodideis a hypotheticalinorganic compoundwith 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]
Claims
[edit]Phosphorus pentaiodide was reported to be a brown-black crystalline solid melting at 41 °C produced by the reaction oflithium iodideandphosphorus pentachlorideinmethyl iodide,however, this claim is disputed and probably generated a mixture ofphosphorus triiodideandiodine.[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]
Derivatives
[edit]Unlike the elusivePI5,the[PI4]+cation (tetraiodophosphonium cation) is widely known. This cation is known with the anionstetraiodoaluminate[AlI4]−,hexafluoroarsenate[AsF6]−,hexafluoroantimonate[SbF6]−and tetraiodogallate[GaI4]−.[4][5]
References
[edit]- ^abcdN. G. Feshchenko; V. G. Kostina; A. V. Kirsanov (1978). "ChemInformAbstract: SYNTHESIS OF PHOSPHORUS PENTAIODIDE ".Russian Journal of General Chemistry.48(23): 195.doi:10.1002/chin.197823039.
- ^Walker and Johnson, J. Chem. Soc.87,1595 (1905).
- ^Greenwood, Norman N.;Earnshaw, Alan (1997).Chemistry of the Elements(2nd ed.).Butterworth-Heinemann.ISBN978-0-08-037941-8.
- ^abInis Tornieporth-Getting; Thomas Klapötke (1990). "The preparation and characterization by Raman spectroscopy of Pl4+AsF6– containing the tetraiodophosphonium cation".Journal of the Chemical Society, Chemical Communications(2): 132–133.doi:10.1039/C39900000132.
- ^abMartin Kaupp; Christoph Aubauer; Günter Engelhardt; Thomas M. Klapötke; Olga L. Malkina (1999). "The PI+4 cation has an extremely large negative 31P nuclear magnetic resonance chemical shift, due to spin–orbit coupling: A quantum-chemical prediction and its confirmation by solid-state nuclear magnetic resonance spectroscopy".The Journal of Chemical Physics.110(8): 3897–3902.Bibcode:1999JChPh.110.3897K.doi:10.1063/1.478243.
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