Phosphorus oxide

Phosphorus oxide can refer to:

• Phosphorus pentoxide (phosphorus(V) oxide, phosphoric anhydride), P₂O₅
• Phosphorus trioxide (phosphorus(III) oxide, phosphorous anhydride), P₂O₃
• Phosphorus tetroxide, P₂O₄

Between the commercially important P₄O₆ and P₄O₁₀, several other, less common oxides of phosphorus are known. Specifically, P₄O₇, P₄O₉, and P₂O₆ all bear structures intermediate between the endmembers:^[1]

On observation it will be seen that double bonded oxygen in P₄O₈ at 1,2 position or 1,3 position are identical and both positions have same steric hindrance. Cycle 12341 and ABCDA are identical.

Gases:

• Phosphorus monoxide, PO
• Phosphorus dioxide, PO₂