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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Caesiumhyperoxid</span></h1>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="de" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="de" dir="ltr"><table class="wikitable infobox float-right" id="Vorlage_Infobox_Chemikalie" style="font-size:90%; margin-top:0; width:350px;" summary="Infobox Chemikalie">

<tbody><tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Kristallstruktur
</th></tr>
<tr>
<td colspan="2" class="hintergrundfarbe-basis" style="text-align:center;"><span typeof="mw:File"></span>
</td></tr>
<tr>
<td colspan="2" style="text-align:center; font-size:80%;"><span style="background:#C0C0C0;border-radius: 12px;color: transparent; width: 12px; line-height:12px;display:inline-block;">_</span> <a href="Caesium" title="Caesium">Cs</a><sup>+</sup> <span style="visibility:hidden;">0</span> <span style="background:#FF0000;border-radius: 12px;color: transparent; width: 12px; line-height:12px;display:inline-block;">_</span>–<span style="background:#FF0000;border-radius: 12px;color: transparent; width: 12px; line-height:12px;display:inline-block;">_</span> <a href="Sauerstoff" title="Sauerstoff">[O–O]</a><sup>−</sup>
</td></tr>








<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Allgemeines
</th></tr>
<tr>
<td style="width:33%;">Name
</td>
<td>Caesiumhyperoxid
</td></tr>
<tr>
<td>Andere Namen
</td>
<td>
<p>Caesiumsuperoxid (veraltet)
</p>
</td></tr>
<tr>
<td><a href="Verh%C3%A4ltnisformel" title="Verhältnisformel">Verhältnisformel</a>
</td>
<td>CsO<sub>2</sub>
</td></tr>
<tr>
<td>Kurzbeschreibung
</td>
<td>
<p>gelber bis orangefarbener Feststoff<sup id="cite_ref-webelements_1-0" class="reference"><a href="#cite_note-webelements-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>
<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Externe Identifikatoren/Datenbanken
</th></tr>
<tr>
<td colspan="2" style="padding:0;">
<table class="mw-collapsible mw-collapsed wikitable" data-expandtext="+" data-collapsetext="−" style="border-top:none; margin:-1px; width:calc(100% + 2px);">

<tbody><tr>
<td style="width:33%;"><a href="CAS-Nummer" title="CAS-Nummer">CAS-Nummer</a>
</td>
<td><span title="Untervorlage eingebunden: CASRN"></span><span class="KeinCASLink" title="CAS-Nummer ohne Common-Chemistry-Eintrag">12018-61-0</span><span class="editoronly" style="display:none;"></span>
</td>
<td style="background:#FFDEAD; color:#202122; border-top:1px solid #FFDEAD; padding:0.2em 0; vertical-align:bottom; width:5%;">
</td></tr>










<tr>
<td style="border-right:1px solid #a2a9b1;"><a href="Wikidata" title="Wikidata">Wikidata</a>
</td>
<td colspan="2"><a href="https://www.wikidata.org/wiki/Q1025477" class="extiw external" title="d:Q1025477">Q1025477</a>
</td></tr></tbody></table>
</td></tr>








<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Eigenschaften
</th></tr>
<tr>
<td><a href="Molare_Masse" title="Molare Masse">Molare Masse</a>
</td>
<td>164,9 g·<a href="Mol" title="Mol">mol</a><sup>−1</sup>
</td></tr>
<tr>
<td><a href="Aggregatzustand" title="Aggregatzustand">Aggregatzustand</a>
</td>
<td>
<p>fest
</p>
</td></tr>
<tr>
<td><a href="Dichte" title="Dichte">Dichte</a>
</td>
<td>
<p>3,77 g·cm<sup>−3</sup><sup id="cite_ref-webelements_1-1" class="reference"><a href="#cite_note-webelements-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>
<tr>
<td><a href="Schmelzpunkt" title="Schmelzpunkt">Schmelzpunkt</a>
</td>
<td>
<p>600 <a href="Grad_Celsius" title="Grad Celsius">°C</a><sup id="cite_ref-Howi_2-0" class="reference"><a href="#cite_note-Howi-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>














<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Sicherheitshinweise
</th></tr>


<tr>
<td colspan="2">
<table cellspacing="0" cellpadding="2" style="width:100%;">




<tbody><tr>
<td colspan="2" style="text-align:center"><b><a href="Global_harmonisiertes_System_zur_Einstufung_und_Kennzeichnung_von_Chemikalien" title="Global harmonisiertes System zur Einstufung und Kennzeichnung von Chemikalien">GHS-Gefahrstoffkennzeichnung</a></b><br><i>keine Einstufung verfügbar</i><sup id="cite_ref-NV_3-0" class="reference"><a href="#cite_note-NV-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>
</td></tr></tbody></table>
</td></tr>








<tr>
<th colspan="2" style="background:#FFDEAD; color:#202122;">Thermodynamische Eigenschaften
</th></tr>
<tr>
<td><a href="Standardbildungsenthalpie" class="mw-redirect" title="Standardbildungsenthalpie">ΔH<sub>f</sub><sup>0</sup></a>
</td>
<td>
<p>−295&nbsp;kJ/mol<sup id="cite_ref-wiberg1_4-0" class="reference"><a href="#cite_note-wiberg1-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>
</p>
</td></tr>
<tr>
<td colspan="2" style="background:#FFDEAD; color:#202122; font-size:80%; text-align:center; line-height:150%; padding:.25em;">Wenn nicht anders vermerkt, gelten die angegebenen Daten bei <a href="Standardbedingungen" title="Standardbedingungen">Standardbedingungen</a> (0 °C, 1000&nbsp;hPa).
</td></tr></tbody></table><p><span class="editoronly" style="display:none;"></span>
</p><p><b>Caesiumhyperoxid</b> (veraltet Caesiumsuperoxid) ist eine <a href="Chemische_Verbindung" title="Chemische Verbindung">chemische Verbindung</a> des <a href="Caesium" title="Caesium">Caesiums</a> und zählt zu den <a href="Hyperoxide" title="Hyperoxide">Hyperoxiden</a>, besitzt also O<sub>2</sub><sup>−</sup> als <a href="Anion" title="Anion">Anion</a>. Es ist ein orangefarbener Feststoff.
</p>

<div class="mw-heading mw-heading2"><h2 id="Gewinnung_und_Darstellung">Gewinnung und Darstellung</h2></div>
<p>Caesiumhyperoxid bildet sich beim Verbrennen von Caesium im <a href="Sauerstoff" title="Sauerstoff">Sauerstoffüberschuss</a>.<sup id="cite_ref-Howi_2-1" class="reference"><a href="#cite_note-Howi-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p>
<dl><dd><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {Cs + O2 -> CsO2}}}">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<mrow class="MJX-TeXAtom-ORD">
<mtext>Cs</mtext>
<mo>+</mo>
<msubsup>
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<mrow class="MJX-TeXAtom-ORD">
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<mo stretchy="false">⟶<!-- ⟶ --></mo>
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<mn>2</mn>
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<annotation encoding="application/x-tex">{\displaystyle {\ce {Cs + O2 -&gt; CsO2}}}</annotation>
</semantics>
</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/c6436c3c4915e1b7cadb1a9b40e8d7fdf1ab8440.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:18.85ex; height:2.843ex;" alt="{\displaystyle {\mathrm {Cs} {}+{}\mathrm {O} {\vphantom {A}}_{\smash[{t}]{2}}{}\mathrel {\longrightarrow } {}\mathrm {CsO} {\vphantom {A}}_{\smash[{t}]{2}}}}" loading="lazy"></span></dd></dl>
<div class="mw-heading mw-heading2"><h2 id="Eigenschaften">Eigenschaften</h2></div>
<p>Caesiumhyperoxid <a href="Kristallisation" title="Kristallisation">kristallisiert</a> wie <a href="Kaliumhyperoxid" title="Kaliumhyperoxid">Kalium-</a> und <a href="Rubidiumhyperoxid" title="Rubidiumhyperoxid">Rubidiumhyperoxid</a> in der <a href="Calciumcarbid" title="Calciumcarbid">Calciumcarbid</a>-Struktur. Im Gegensatz zu den <a href="Oxide" title="Oxide">Oxiden</a> gibt es beim Caesiumhyperoxid direkte Sauerstoff-Sauerstoff-Bindungen.<sup id="cite_ref-Howi_2-2" class="reference"><a href="#cite_note-Howi-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p><p>In Wasser <a href="Disproportionierung" title="Disproportionierung">disproportioniert</a> Caesiumhyperoxid zu Sauerstoff, <a href="Wasserstoffperoxid" title="Wasserstoffperoxid">Wasserstoffperoxid</a> und <a href="Caesiumhydroxid" title="Caesiumhydroxid">Caesiumhydroxid</a>.<sup id="cite_ref-Howi_2-3" class="reference"><a href="#cite_note-Howi-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p>
<dl><dd><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {2CsO2 + 2H2O -> O2 ^ + H2O2 + 2CsOH}}}">
<semantics>
<mrow class="MJX-TeXAtom-ORD">
<mstyle displaystyle="true" scriptlevel="0">
<mrow class="MJX-TeXAtom-ORD">
<mn>2</mn>
<mspace width="thinmathspace"></mspace>
<msubsup>
<mtext>CsO</mtext>
<mrow class="MJX-TeXAtom-ORD">
<mn>2</mn>
</mrow>
<mrow class="MJX-TeXAtom-ORD">
<mspace width="0pt" height="0pt" depth=".2em"></mspace>
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<mo>+</mo>
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<mtext>H</mtext>
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</msubsup>
<mtext>O</mtext>
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<mtext>CsOH</mtext>
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</mstyle>
</mrow>
<annotation encoding="application/x-tex">{\displaystyle {\ce {2CsO2 + 2H2O -&gt; O2 ^ + H2O2 + 2CsOH}}}</annotation>
</semantics>
</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/cb7dca3e8bf80db69d053999e2c1bbbced97ce20.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:44.158ex; height:2.843ex;" alt="{\displaystyle {2\,\mathrm {CsO} {\vphantom {A}}_{\smash[{t}]{2}}{}+{}2\,\mathrm {H} {\vphantom {A}}_{\smash[{t}]{2}}\mathrm {O} {}\mathrel {\longrightarrow } {}\mathrm {O} {\vphantom {A}}_{\smash[{t}]{2}}\uparrow {}{}+{}\mathrm {H} {\vphantom {A}}_{\smash[{t}]{2}}\mathrm {O} {\vphantom {A}}_{\smash[{t}]{2}}{}+{}2\,\mathrm {CsOH} }}" loading="lazy"></span></dd></dl>
<p>Die <a href="Standardbildungsenthalpie" class="mw-redirect" title="Standardbildungsenthalpie">Standardbildungsenthalpie</a> von Caesiumhyperoxid beträgt ΔH<sub>f</sub><sup>0</sup>&nbsp;=&nbsp;−295&nbsp;kJ/mol.<sup id="cite_ref-wiberg1_4-1" class="reference"><a href="#cite_note-wiberg1-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Verwendung">Verwendung</h2></div>
<p>Caesiumhyperoxid ist eine mögliche Ausgangsverbindung für die Gewinnung von <a href="Caesiumozonid" title="Caesiumozonid">Caesiumozonid</a>. Dazu wird das Hyperoxid mit <a href="Ozon" title="Ozon">Ozon</a> umgesetzt.<sup id="cite_ref-Howi_2-4" class="reference"><a href="#cite_note-Howi-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>
</p>
<dl><dd><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {CsO2 + O3 -> CsO3 + O2}}}">
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<mrow class="MJX-TeXAtom-ORD">
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<annotation encoding="application/x-tex">{\displaystyle {\ce {CsO2 + O3 -&gt; CsO3 + O2}}}</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/0f935e6bfc04f6a33cf16f00764d1af3d318c71d.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:27.415ex; height:2.843ex;" alt="{\displaystyle {\mathrm {CsO} {\vphantom {A}}_{\smash[{t}]{2}}{}+{}\mathrm {O} {\vphantom {A}}_{\smash[{t}]{3}}{}\mathrel {\longrightarrow } {}\mathrm {CsO} {\vphantom {A}}_{\smash[{t}]{3}}{}+{}\mathrm {O} {\vphantom {A}}_{\smash[{t}]{2}}}}" loading="lazy"></span></dd></dl>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-webelements-1"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-webelements_1-0">a</a></sup> <sup><a href="#cite_ref-webelements_1-1">b</a></sup></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://www.webelements.com/compounds/caesium/caesium_superoxide.html">Caesiumhyperoxid bei webelements.com.</a></span>
</li>
<li id="cite_note-Howi-2"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-Howi_2-0">a</a></sup> <sup><a href="#cite_ref-Howi_2-1">b</a></sup> <sup><a href="#cite_ref-Howi_2-2">c</a></sup> <sup><a href="#cite_ref-Howi_2-3">d</a></sup> <sup><a href="#cite_ref-Howi_2-4">e</a></sup></span> <span class="reference-text"><a href="Arnold_F._Holleman" title="Arnold F. Holleman">A. F. Holleman</a>, <a href="Egon_Wiberg" title="Egon Wiberg">E. Wiberg</a>, <a href="Nils_Wiberg" title="Nils Wiberg">N. Wiberg</a>: <i><a href="Holleman-Wiberg_Lehrbuch_der_Anorganischen_Chemie" title="Holleman-Wiberg Lehrbuch der Anorganischen Chemie">Lehrbuch der Anorganischen Chemie</a>.</i> 102.&nbsp;Auflage. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1, S.&nbsp;1285–1286.<span class="editoronly" style="display:none;"></span></span>
</li>
<li id="cite_note-NV-3"><span class="mw-cite-backlink"><a href="#cite_ref-NV_3-0">↑</a></span> <span class="reference-text">Dieser Stoff wurde in Bezug auf seine Gefährlichkeit entweder noch nicht eingestuft oder eine verlässliche und zitierfähige Quelle hierzu wurde noch nicht gefunden.</span>
</li>
<li id="cite_note-wiberg1-4"><span class="mw-cite-backlink">↑ <sup><a href="#cite_ref-wiberg1_4-0">a</a></sup> <sup><a href="#cite_ref-wiberg1_4-1">b</a></sup></span> <span class="reference-text"><a href="Arnold_F._Holleman" title="Arnold F. Holleman">A. F. Holleman</a>, <a href="Nils_Wiberg" title="Nils Wiberg">N. Wiberg</a>: <i><a href="Holleman-Wiberg_Lehrbuch_der_Anorganischen_Chemie" title="Holleman-Wiberg Lehrbuch der Anorganischen Chemie">Anorganische Chemie</a>.</i> 103.&nbsp;Auflage. 1. Band: <i>Grundlagen und Hauptgruppenelemente.</i> Walter de Gruyter, Berlin / Boston 2016, ISBN 978-3-11-049585-0, S.&nbsp;1515 (<a rel="nofollow" class="external text" href="https://books.google.de/books?id=dgLcDQAAQBAJ&amp;pg=PA1515#v=onepage">eingeschränkte Vorschau</a> in der Google-Buchsuche).<span class="editoronly" style="display:none;"></span></span>
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