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Chlorine perchlorate
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<p>Chlorine perchlorate is a <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> with the formula Cl2O4. This <a href="/facts/Chlorine_oxide/QmrRv4P9">chlorine oxide</a> is an asymmetric oxide, with one chlorine atom in +1 <a href="/facts/Oxidation_state/W53W6s6V">oxidation state</a> and the other +7, with proper formula Cl−O−ClO3. It is produced by the <a href="/facts/Dimerize/mU64PnEq">photodimerization</a> of <a href="/facts/Chlorine_dioxide/1K7ybEdW">chlorine dioxide</a> (ClO2) at room temperature by 436 nm <a href="/facts/Ultraviolet/kncBUqn5">ultraviolet light</a>: </p> 2 ClO2 → ClOClO3 <p>Chlorine perchlorate can also be made by the following reaction at −45 °C. </p> CsClO4 + ClOSO2F → CsSO3F + ClOClO3