<p><b>二氟化二硫</b>是一種硫的鹵化物，化學式為S<sub>2</sub>F<sub>2</sub>。在嚴格乾燥的容器中用二氟化銀和硫單質，可得結構式為FS-SF的二氟化二硫：</p>
<dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\rm {\ 2S+2AgF_{2}{\xrightarrow {398K}}S_{2}F_{2}+2AgF}}}">
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    <annotation encoding="application/x-tex">{\displaystyle {\rm {\ 2S+2AgF_{2}{\xrightarrow {398K}}S_{2}F_{2}+2AgF}}}</annotation>
  </semantics></math></span></span></dd></dl><p>存在鹼金屬氟化物時，二氟化二硫會發生分子內重排，轉變為S=SF<sub>2</sub>：</p>
<dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\rm {\ FS-SF{\xrightarrow {KF}}S=SF_{2}}}}">
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    <annotation encoding="application/x-tex">{\displaystyle {\rm {\ FS-SF{\xrightarrow {KF}}S=SF_{2}}}}</annotation>
  </semantics></math></span></span></dd></dl><p>S=SF<sub>2</sub>也可由氟亞磺酸鉀與二氯化二硫反應製得：
</p>
<dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\rm {\ 2KSO_{2}F+S_{2}Cl_{2}\rightarrow S=SF_{2}+2KCl+2SO_{2}}}}">
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    <annotation encoding="application/x-tex">{\displaystyle {\rm {\ 2KSO_{2}F+S_{2}Cl_{2}\rightarrow S=SF_{2}+2KCl+2SO_{2}}}}</annotation>
  </semantics></math></span></span></dd></dl><h2><span id=".E5.8F.8D.E5.BA.94"></span><span id="反应">反應</span></h2>
<ul><li>加熱時分解成四氟化硫和硫：</li></ul><dl><dd><dl><dd>2S<sub>2</sub>F<sub>2</sub> -&gt;SF<sub>4</sub> + 3S</dd></dl></dd></dl><ul><li>水解反應：</li></ul><dl><dd><dl><dd>2S<sub>2</sub>F<sub>2</sub> + 2H<sub>2</sub>O -&gt; SO<sub>2</sub> + 3S + 4HF</dd></dl></dd></dl><ul><li>和硫酸的反應：</li></ul><dl><dd><dl><dd>S<sub>2</sub>F<sub>2</sub>+ 3H<sub>2</sub>SO<sub>4</sub> -&gt; 5SO<sub>2</sub> + 2HF+ 2H2O</dd></dl></dd></dl><ul><li>和氫氧化鈉的反應：</li></ul><dl><dd><dl><dd>2S<sub>2</sub>F<sub>2</sub> + 6NaOH -&gt; Na2SO<sub>3</sub> + 3S + 4NaF + 3H<sub>2</sub>O</dd></dl></dd></dl><ul><li>在高壓下和氧氣反應，催化劑為二氧化氮：</li></ul><dl><dd><dl><dd>2S<sub>2</sub>F<sub>2</sub> + 5O<sub>2</sub> —NO<sub>2</sub>-&gt; SOF<sub>4</sub> + 3SO<sub>3</sub> </dd></dl></dd></dl><ul><li>在低溫下和二氟化硫反應，形成<span data-orig-title="1,3-二氟三硫烷-1,1-二氟化物" data-lang-code="en" data-lang-name="英語" data-foreign-title="1,3-Difluoro-trisulfane-1,1-difluoride"><span>1,3-二氟三硫烷-1,1-二氟化物</span></span>。</li></ul><dl><dd><dl><dd>SSF<sub>2</sub> + SF<sub>2</sub> → FSSSF<sub>3</sub></dd></dl></dd></dl><h2><span id=".E5.8F.82.E8.80.83.E8.B5.84.E6.96.99"></span><span id="参考资料">參考資料</span></h2>

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**二氟化二硫**是一種硫的鹵化物，化學式為 S2F2。在嚴格乾燥的容器中用二氟化銀和硫單質，可得結構式為 FS-SF 的二氟化二硫：

　
: ${\rm {\ 2S+2AgF_{2}{\xrightarrow {398K}}S_{2}F_{2}+2AgF}}$

存在鹼金屬氟化物時，二氟化二硫會發生分子內重排，轉變為 S=SF2：

　
: ${\rm {\ FS-SF{\xrightarrow {KF}}S=SF_{2}}}$

S=SF2 也可由氟亞磺酸鉀與二氯化二硫反應製得：

　
: ${\rm {\ 2KSO_{2}F+S_{2}Cl_{2}\rightarrow S=SF_{2}+2KCl+2SO_{2}}}$

## 反應

* 加熱時分解成四氟化硫和硫：

　
: : 2S2F2 ->SF4 + 3S

* 水解反應：

　
: : 2S2F2 + 2H2O -> SO2 + 3S + 4HF

* 和硫酸的反應：

　
: : S2F2+ 3H2SO4 -> 5SO2 + 2HF+ 2H2O

* 和氫氧化鈉的反應：

　
: : 2S2F2 + 6NaOH -> Na2SO3 + 3S + 4NaF + 3H2O

* 在高壓下和氧氣反應，催化劑為二氧化氮：

　
: : 2S2F2 + 5O2 —NO2-> SOF4 + 3SO3

* 在低溫下和二氟化硫反應，形成 1,3 - 二氟三硫烷 - 1,1 - 二氟化物。

　
: : SSF2 + SF2 → FSSSF3

## 參考資料
13709-35-8