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Dichlorine hexoxide
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<p>Dichlorine hexoxide is the <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> with the <a href="/facts/Molecular_formula/hghUtthl">molecular formula</a> Cl2O6 or O2Cl−O−ClO3, which is correct for its gaseous state. However, in liquid or solid form, this <a href="/facts/Chlorine_oxide/QmrRv4P9">chlorine oxide</a> ionizes into the dark red ionic compound chloryl perchlorate or dioxochloronium(V) perchlorate [ClO2]+[ClO4]−, which may be thought of as the mixed <a href="/facts/Acidic_oxide/2h1jor4I">anhydride</a> of <a href="/facts/Chloric_acid/Cc7m9mg6">chloric</a> and <a href="/facts/Perchloric_acid/gjhK386J">perchloric acids</a>. This compound is a notable perchlorating agent. </p><p>It is produced by reaction between <a href="/facts/Chlorine_dioxide/1K7ybEdW">chlorine dioxide</a> and excess <a href="/facts/Ozone/o0E5gn2p">ozone</a>: </p> 2 ClO2 + 2 O3 → 2 ClO3 + 2 O2 → Cl2O6 + 2 O2