| Identification | Back Directory | [Name]
PHOSPHONIUM IODIDE | [CAS]
12125-09-6 | [Synonyms]
jodphosphonium
iodinephosphide
iodophosphorane
PHOSPHONIUM IODIDE
Tetrahydridephosphorus iodide
Phosphonium iodide ((PH4)I) (9CI) | [EINECS(EC#)]
235-189-0 | [Molecular Formula]
H4IP | [MDL Number]
MFCD00036313 | [MOL File]
12125-09-6.mol | [Molecular Weight]
161.91 |
| Chemical Properties | Back Directory | [Melting point ]
18.5° under its own vapor pressure | [Boiling point ]
62.5°C (estimate) | [density ]
2.860 | [solubility ]
reacts with H2O, ethanol | [form ]
colorless tetragonal crystals | [color ]
colorless tetragonal crystals, crystalline | [Water Solubility ]
decomposed by H2O, alcohol, evolving phosphine gas [HAW93] |
| Hazard Information | Back Directory | [Chemical Properties]
large, transparent, colorless crystal(s); tetr; sublimes at room temp; decomposes to PH3 and HI when heated or in presence of alcohol or water; rapid heating causes detonation [MER06] | [Uses]
In the laboratory preparation of phosphine. | [Physical properties]
Colorless tetragonal crystal; deliquesces; density 2.86 g/cm3; sublimes at ordinary temperatures; vapor pressure 50 torr at 20°C, 760 torr at 61.8°C; melts at 18.5°C under its own vapor pressure; boils at 80°C; decomposes in water; soluble in acids and alkalies with decomposition; decomposes in ethanol. | [Preparation]
Phosphonium iodide may be prepared by the action of phosphine with dry hydrogen iodide:
PH3 + HI → PH4I
Solid phosphonium iodide may be produced in the laboratory by slowly and very cautiously adding water to an intimate mixture of white phosphorus and iodine. Also, this phosphorus-iodine mixture may be obtained by mixing solutions in carbon disulfide and carefully evaporating the solvent in a stream of inert gas:
P4 + I + H2O → PH4I + H3PO4
2P + I2 + 4H2O → PH4I + H3PO4 + HI
Also, the compound can be prepared by hydrolysis of a mixture of diphosphorus tetraiodide and white phosphorus:
P2I4 + P + H2O → PH4I + H3PO4. | [Hazard]
Phosphonium iodide detonates on rapid heating. It dissociates by water, alcohol or heat, evolving toxic phosphine gas. |
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