Antimony triiodide

<p>Antimony triiodide is the <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> with the formula <a href="/facts/Antimony/YsA7lVgT">Sb</a><a href="/facts/Iodine/JlfMecMf">I3</a>.  This ruby-red solid is the only characterized "binary" <a href="/facts/Iodide/JyVRGWMX">iodide</a> of <a href="/facts/Antimony/YsA7lVgT">antimony</a>, i.e. the sole compound isolated with the formula SbxIy. It contains antimony in its +3 oxidation state. Like many iodides of the heavier <a href="/facts/Main_group_element/2AG3QxJl">main group elements</a>, its structure depends on the phase.  Gaseous SbI3 is a molecular, pyramidal species as anticipated by <a href="/facts/VSEPR_theory/WqsRgVRV">VSEPR theory</a>.  In the solid state, however, the Sb center is surrounded by an <a href="/facts/Octahedron/G38q92xW">octahedron</a> of six iodide ligands, three of which are closer and three more distant.   For the related compound <a href="/facts/Bismuth/75FLjkoX">Bi</a>I3, all six Bi—I distances are equal.
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Antimony triiodide open-in-new

Antimony triiodide