Phosphorus Halide - Oxidation State +2 (P2X4)

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.

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