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Dichlorine heptoxide
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<p>Dichlorine heptoxide is the <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> Cl2O7. This <a href="/facts/Chlorine_oxide/QmrRv4P9">chlorine oxide</a> is the <a href="/facts/Acid_anhydride/0LvHIgAY">anhydride</a> of <a href="/facts/Perchloric_acid/gjhK386J">perchloric acid</a>. It is produced by the careful distillation of perchloric acid in the presence of the dehydrating agent <a href="/facts/Phosphorus_pentoxide/GKTSUNqS">phosphorus pentoxide</a>: </p> 2 HClO4 + P4O10 → Cl2O7 + H2P4O11 <p>Cl2O7 can be distilled off from the mixture. </p><p>It may also be formed by illumination of mixtures of chlorine and <a href="/facts/Ozone/o0E5gn2p">ozone</a> with blue light. It slowly <a href="/facts/Hydrolyzes/JTvwIHPs">hydrolyzes</a> back to <a href="/facts/Perchloric_acid/gjhK386J">perchloric acid</a>. </p>