Chemistry:Phosphorus pentaiodide
| Names | |
|---|---|
| IUPAC name
Phosphorus(V) iodide
| |
Other names
| |
| Identifiers | |
| Properties | |
| PI 5 | |
| 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). | |
| Infobox references | |
Phosphorus pentaiodide is a hypothetical inorganic compound with formula PI
5. 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 PI
3 · I
2, but certainly not as [PI
4]+
I−
...)".[3]
Claims
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 [PI
4]+
I−
(tetraiodophosphonium iodide), experimental and theoretical data refutes this claim.[5][1]
Derivatives
Unlike the elusive PI
5, the [PI
4]+
cation (tetraiodophosphonium cation) is widely known. This cation is known with the anions tetraiodoaluminate [AlI
4]−
, hexafluoroarsenate [AsF
6]−
, hexafluoroantimonate [SbF
6]−
and tetraiodogallate [GaI
4]−
. [4][5]
References
- ↑ 1.0 1.1 1.2 1.3 N. G. Feshchenko; V. G. Kostina; A. V. Kirsanov (1978). "Chem Inform Abstract: 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. ISBN 978-0-08-037941-8.
- ↑ 4.0 4.1 Inis Tornieporth-Getting; Thomas Klapötke (1990). "The preparation and characterization by Raman spectroscopy of Pl4+AsF6– containing the tetraiodophosphonium cation" (in en). Journal of the Chemical Society, Chemical Communications (2): 132–133. doi:10.1039/C39900000132.
- ↑ 5.0 5.1 Martin 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" (in en). The Journal of Chemical Physics 110 (8): 3897–3902. doi:10.1063/1.478243. Bibcode: 1999JChPh.110.3897K.
| HI | He | ||||||||||||||||
| LiI | BeI2 | BI3 | CI4 | NI3 | I2O4, I2O5, I4O9 |
IF, IF3, IF5, IF7 |
Ne | ||||||||||
| NaI | MgI2 | AlI3 | SiI4 | PI3, P2I4 |
S | ICl, ICl3 |
Ar | ||||||||||
| KI | CaI2 | Sc | TiI4 | VI3 | CrI3 | MnI2 | FeI2 | CoI2 | NiI2 | CuI | ZnI2 | Ga2I6 | GeI2, GeI4 |
AsI3 | Se | IBr | Kr |
| RbI | SrI2 | YI3 | ZrI4 | NbI5 | Mo | Tc | Ru | Rh | Pd | AgI | CdI2 | InI3 | SnI4, SnI2 |
SbI3 | TeI4 | I | Xe |
| CsI | BaI2 | HfI4 | TaI5 | W | Re | Os | Ir | Pt | AuI | Hg2I2, HgI2 |
TlI | PbI2 | BiI3 | Po | AtI | Rn | |
| Fr | RaI2 | Rf | Db | Sg | Bh | Hs | Mt | Ds | Rg | Cn | Nh | Fl | Mc | Lv | Ts | Og | |
| ↓ | |||||||||||||||||
| La | Ce | Pr | Nd | Pm | SmI2 | Eu | Gd | TbI3 | Dy | Ho | Er | Tm | Yb | Lu | |||
| Ac | ThI4 | Pa | UI3, UI4 |
Np | Pu | Am | Cm | Bk | Cf | EsI3 | Fm | Md | No | Lr | |||
 |  |
