<p><b>四硫代鉬酸銨</b>是一種無機化合物，化學式為(NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub>。
</p>
<h2><span id=".E5.88.B6.E5.A4.87"></span><span id="制备">製備</span></h2>
<p>四硫代鉬酸銨可由仲鉬酸銨、氨水和硫化氫反應得到，反應在65~70℃水浴中進行：</p>
<dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {(NH4)6Mo7O24 * 4H2O + 8 NH3*H2O + 28 H2S -&gt; 7 (NH4)2MoS4 + 36 H2O}}}">
  <semantics>
    <mrow class="MJX-TeXAtom-ORD">
      <mstyle displaystyle="true" scriptlevel="0">
        <mrow class="MJX-TeXAtom-ORD">
          <msubsup>
            <mrow class="MJX-TeXAtom-ORD">
              <mo stretchy="false">(</mo>
              <msubsup>
                <mtext>NH</mtext>
                <mrow class="MJX-TeXAtom-ORD">
                  <mn>4</mn>
                </mrow>
                <mrow class="MJX-TeXAtom-ORD">
                  <mspace width="0pt" height="0pt" depth=".2em"></mspace>
                </mrow>
              </msubsup>
              <mo stretchy="false">)</mo>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>6</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <msubsup>
            <mtext>Mo</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>7</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <msubsup>
            <mtext>O</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>24</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mo>⋅<!-- ⋅ --></mo>
          <mn>4</mn>
          <mspace width="thinmathspace"></mspace>
          <msubsup>
            <mtext>H</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mtext>O</mtext>
          <mo>+</mo>
          <mn>8</mn>
          <mspace width="thinmathspace"></mspace>
          <msubsup>
            <mtext>NH</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>3</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mo>⋅<!-- ⋅ --></mo>
          <msubsup>
            <mtext>H</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mtext>O</mtext>
          <mo>+</mo>
          <mn>28</mn>
          <mspace width="thinmathspace"></mspace>
          <msubsup>
            <mtext>H</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mtext>S</mtext>
          <mo stretchy="false">⟶<!-- ⟶ --></mo>
          <mn>7</mn>
          <mspace width="thinmathspace"></mspace>
          <msubsup>
            <mrow class="MJX-TeXAtom-ORD">
              <mo stretchy="false">(</mo>
              <msubsup>
                <mtext>NH</mtext>
                <mrow class="MJX-TeXAtom-ORD">
                  <mn>4</mn>
                </mrow>
                <mrow class="MJX-TeXAtom-ORD">
                  <mspace width="0pt" height="0pt" depth=".2em"></mspace>
                </mrow>
              </msubsup>
              <mo stretchy="false">)</mo>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <msubsup>
            <mtext>MoS</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>4</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mo>+</mo>
          <mn>36</mn>
          <mspace width="thinmathspace"></mspace>
          <msubsup>
            <mtext>H</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mtext>O</mtext>
        </mrow>
      </mstyle>
    </mrow>
    <annotation encoding="application/x-tex">{\displaystyle {\ce {(NH4)6Mo7O24 * 4H2O + 8 NH3*H2O + 28 H2S -&gt; 7 (NH4)2MoS4 + 36 H2O}}}</annotation>
  </semantics></math></span></span></dd></dl><p>為避免使用劇毒的硫化氫氣體，也可先將鉬酸銨（或三氧化鉬）溶於濃氨水，然後加入硫化銨進行反應：</p>
<dl><dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {(NH4)6Mo7O24 + 8 NH3* H2O -&gt; 7 (NH4)2MoO4 + 4 H2O}}}">
  <semantics>
    <mrow class="MJX-TeXAtom-ORD">
      <mstyle displaystyle="true" scriptlevel="0">
        <mrow class="MJX-TeXAtom-ORD">
          <msubsup>
            <mrow class="MJX-TeXAtom-ORD">
              <mo stretchy="false">(</mo>
              <msubsup>
                <mtext>NH</mtext>
                <mrow class="MJX-TeXAtom-ORD">
                  <mn>4</mn>
                </mrow>
                <mrow class="MJX-TeXAtom-ORD">
                  <mspace width="0pt" height="0pt" depth=".2em"></mspace>
                </mrow>
              </msubsup>
              <mo stretchy="false">)</mo>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>6</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <msubsup>
            <mtext>Mo</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>7</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <msubsup>
            <mtext>O</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>24</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mo>+</mo>
          <mn>8</mn>
          <mspace width="thinmathspace"></mspace>
          <msubsup>
            <mtext>NH</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>3</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mo>⋅<!-- ⋅ --></mo>
          <msubsup>
            <mtext>H</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mtext>O</mtext>
          <mo stretchy="false">⟶<!-- ⟶ --></mo>
          <mn>7</mn>
          <mspace width="thinmathspace"></mspace>
          <msubsup>
            <mrow class="MJX-TeXAtom-ORD">
              <mo stretchy="false">(</mo>
              <msubsup>
                <mtext>NH</mtext>
                <mrow class="MJX-TeXAtom-ORD">
                  <mn>4</mn>
                </mrow>
                <mrow class="MJX-TeXAtom-ORD">
                  <mspace width="0pt" height="0pt" depth=".2em"></mspace>
                </mrow>
              </msubsup>
              <mo stretchy="false">)</mo>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <msubsup>
            <mtext>MoO</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>4</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mo>+</mo>
          <mn>4</mn>
          <mspace width="thinmathspace"></mspace>
          <msubsup>
            <mtext>H</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mtext>O</mtext>
        </mrow>
      </mstyle>
    </mrow>
    <annotation encoding="application/x-tex">{\displaystyle {\ce {(NH4)6Mo7O24 + 8 NH3* H2O -&gt; 7 (NH4)2MoO4 + 4 H2O}}}</annotation>
  </semantics></math></span></span></dd>
<dd><span><span><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {(NH4)2MoO4 + 4 (NH4)2S -&gt; (NH4)2MoS4 + 4 NH3*H2O}}}">
  <semantics>
    <mrow class="MJX-TeXAtom-ORD">
      <mstyle displaystyle="true" scriptlevel="0">
        <mrow class="MJX-TeXAtom-ORD">
          <msubsup>
            <mrow class="MJX-TeXAtom-ORD">
              <mo stretchy="false">(</mo>
              <msubsup>
                <mtext>NH</mtext>
                <mrow class="MJX-TeXAtom-ORD">
                  <mn>4</mn>
                </mrow>
                <mrow class="MJX-TeXAtom-ORD">
                  <mspace width="0pt" height="0pt" depth=".2em"></mspace>
                </mrow>
              </msubsup>
              <mo stretchy="false">)</mo>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <msubsup>
            <mtext>MoO</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>4</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mo>+</mo>
          <mn>4</mn>
          <mspace width="thinmathspace"></mspace>
          <msubsup>
            <mrow class="MJX-TeXAtom-ORD">
              <mo stretchy="false">(</mo>
              <msubsup>
                <mtext>NH</mtext>
                <mrow class="MJX-TeXAtom-ORD">
                  <mn>4</mn>
                </mrow>
                <mrow class="MJX-TeXAtom-ORD">
                  <mspace width="0pt" height="0pt" depth=".2em"></mspace>
                </mrow>
              </msubsup>
              <mo stretchy="false">)</mo>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mtext>S</mtext>
          <mo stretchy="false">⟶<!-- ⟶ --></mo>
          <msubsup>
            <mrow class="MJX-TeXAtom-ORD">
              <mo stretchy="false">(</mo>
              <msubsup>
                <mtext>NH</mtext>
                <mrow class="MJX-TeXAtom-ORD">
                  <mn>4</mn>
                </mrow>
                <mrow class="MJX-TeXAtom-ORD">
                  <mspace width="0pt" height="0pt" depth=".2em"></mspace>
                </mrow>
              </msubsup>
              <mo stretchy="false">)</mo>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <msubsup>
            <mtext>MoS</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>4</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mo>+</mo>
          <mn>4</mn>
          <mspace width="thinmathspace"></mspace>
          <msubsup>
            <mtext>NH</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>3</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mo>⋅<!-- ⋅ --></mo>
          <msubsup>
            <mtext>H</mtext>
            <mrow class="MJX-TeXAtom-ORD">
              <mn>2</mn>
            </mrow>
            <mrow class="MJX-TeXAtom-ORD">
              <mspace width="0pt" height="0pt" depth=".2em"></mspace>
            </mrow>
          </msubsup>
          <mtext>O</mtext>
        </mrow>
      </mstyle>
    </mrow>
    <annotation encoding="application/x-tex">{\displaystyle {\ce {(NH4)2MoO4 + 4 (NH4)2S -&gt; (NH4)2MoS4 + 4 NH3*H2O}}}</annotation>
  </semantics></math></span></span></dd></dl><p>反應過程中，MoO<sub>4</sub><sup>2-</sup>中的氧被硫取代，顏色變為黃色（MoO<sub>3</sub>S<sup>2-</sup>）、橙紅色（MoOS<sub>3</sub><sup>2-</sup>）至血紅色（MoS<sub>4</sub><sup>2-</sup>），而MoO<sub>2</sub>S<sub>2</sub><sup>2-</sup>出現的時間很短（反應很快），因此難以觀察到橙色。
</p>
<h2><span id=".E5.8F.82.E8.80.83.E6.96.87.E7.8C.AE"></span><span id="参考文献">參考文獻</span></h2>
**四硫代鉬酸銨**是一種無機化合物，化學式為 (NH4)2MoS4。

## 製備

四硫代鉬酸銨可由仲鉬酸銨、氨水和硫化氫反應得到，反應在 65~70℃水浴中進行：

　
: ${\ce {(NH4)6Mo7O24 * 4H2O + 8 NH3*H2O + 28 H2S -> 7 (NH4)2MoS4 + 36 H2O}}$

為避免使用劇毒的硫化氫氣體，也可先將鉬酸銨（或三氧化鉬）溶於濃氨水，然後加入硫化銨進行反應：

　
: ${\ce {(NH4)6Mo7O24 + 8 NH3* H2O -> 7 (NH4)2MoO4 + 4 H2O}}$

　
: ${\ce {(NH4)2MoO4 + 4 (NH4)2S -> (NH4)2MoS4 + 4 NH3*H2O}}$

反應過程中，MoO42-中的氧被硫取代，顏色變為黃色（MoO3S2-）、橙紅色（MoOS32-）至血紅色（MoS42-），而 MoO2S22-出現的時間很短（反應很快），因此難以觀察到橙色。

## 參考文獻
15060-55-6