Oxidation State +2 (P2X4)
| Chemical formula | CAS number | Melting point | Boiling point | P–X bond length | P–P bond length | X–P–X bond angle | X–P–P bond angle |
|---|---|---|---|---|---|---|---|
| P2F4 | -86.5°C | -6.2°C | 159 pm | 228 pm | 99.1° | 98.4° | |
| P2Cl4 | -28°C | ~180°C d | |||||
| P2Br4 | poorly characterized | ||||||
| P2I4 | 125.5°C | d | 248 pm | 221 pm | 102.3° | 94.0° | |
Phosphorus(II) halides may be prepared by passing an electric discharge through a mixture of the trihalide vapour and hydrogen gas. The relatively stable P2I4 is known to have a trans, bent configuration similar to hydrazine and finds some uses in organic syntheses, the others are of purely academic interest at the present time. Diphosphorus tetrabromide is particularly poorly described.
Read more about this topic: Phosphorus Halide
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